Security Risk Category
Authentication Bypass Security Risks — Page 2
Published vulnerability pages connected to Authentication Bypass. Each page keeps one canonical URL and focused remediation guidance.
118 published Authentication Bypass risks
Authentication Bypass risks
Showing 37–72 of 118 published risks.
CVE-2026-44040 UltraVNC Weak RNG Authentication Challenge
UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes() function seeds libc rand() with time(0) + getpid() + rand() and generates a 16-byte challenge. The combined seed space is approximately 31 bits (libc rand() internal state) and is entirely determined by publicly-observable values (wall-clock time and process ID). An attacker who can observe the authentication exchange can enumerate the seed space and predict the challenge within seconds, enabling forgery or offline brute-forcing of responses. Note: on Windows, the active code path may use vncEncryptBytes2.cpp which calls CryptGenRandom; reachability on shipped Windows binaries requires compile-graph verification and is under investigation.
Updated Jul 15, 2026
CVE-2026-7839 UltraVNC Repeater Hardcoded Default Password
UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password. In repeater/webgui/settings.c:197, when settings2.txt is absent on first run the repeater writes the literal string "adminadmi2" as the admin password via strcpy_s(saved_password, 64, "adminadmi2"). The HTTP Basic-auth handler wi_decode_auth() checks this password without rate-limiting or lockout. Any remote attacker who can reach the repeater HTTP port (default TCP 80) can authenticate as administrator using the well-known default credential on a fresh or unmodified installation, gaining full control of the repeater configuration including allow/deny rules and session visibility.
Updated Jul 15, 2026
CVE-2026-53904 MCO Password Reset Denial of Service Vulnerability
MCO is vulnerable to Account Denial of Service due to improper implementation of password reset functionality. Each password reset request invalidates previously set password as well as previously issued temporary passwords, furthermore, password resets are not limited in any way. An attacker who provides victim's email and answer to their security question, can successfully initiate the reset process and continuously invalidate credentials, effectively locking the victim out of their account. Answering security questions has a limited number of tries which lowers the risk of this vulnerability. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
Updated Jul 15, 2026
CVE-2026-53908 MyComplianceOffice User Enumeration Vulnerability
MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and email addresses. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
Updated Jul 15, 2026
CVE-2026-56259 Crawl4AI Credential Exfiltration Vulnerability
Crawl4AI before 0.8.8 contains credential exfiltration vulnerabilities in the Docker API server that allow attackers to redirect LLM API calls to attacker-controlled endpoints and read arbitrary environment variables. Attackers can exploit the unauthenticated /md, /llm, and /llm/job endpoints by supplying a malicious base_url parameter and setting api_token to env:VARIABLE_NAME to exfiltrate provider API keys and server secrets including JWT SECRET_KEY for authentication bypass.
Updated Jul 15, 2026
CVE-2026-55689 in OpenFGA Helm Charts
OpenFGA is an authorization/permission engine built for developers. Prior to 1.18.0, OpenFGA's OIDC authenticator skipped JWT audience validation when authn.method was set to oidc, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted...
Updated Jul 15, 2026
CVE-2026-57216 in RabbitMQ Server
RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol...
Updated Jul 15, 2026
CVE-2026-45074 in Symfony Security HTTP
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 7.1.0 until 7.4.12 and 8.0.12, Cas2Handler builds the CAS service parameter from Request::getSchemeAndHttpHost(), which reflects an attacker-controlled...
Updated Jul 15, 2026
CVE-2026-45063 in Symfony Security HTTP
Symfony Security HTTP can spoof a certificate identity when X509Authenticator parses a crafted DN.
Updated Jul 15, 2026
CVE-2026-45069 in Symfony Security HTTP
Symfony Security HTTP can accept OIDC tokens that miss required audience, issuer, or expiry claims.
Updated Jul 15, 2026
CVE-2026-47212 in Symfony Twilio Notifier
Symfony Twilio Notifier ignored the Twilio signature header, so fake webhook events could be accepted.
Updated Jul 15, 2026
CVE-2026-48489 in Symfony Security HTTP
Symfony Security HTTP can let a failed login request reach protected GET routes when failure forwarding is enabled.
Updated Jul 15, 2026
CVE-2026-48747 in Symfony Mailomat Mailer
Symfony Mailomat Mailer lets the request choose the HMAC algorithm for webhook signature checks.
Updated Jul 15, 2026
SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion
SAML Single Sign On – SSO Login has a login security issue. In some setups, an attacker may be able to bypass SAML login checks.
Updated Jul 15, 2026
CVE-2026-56271 in Flowise
Flowise can fall back to hardcoded JWT secrets, which lets an attacker forge login tokens and act as any user, including an admin.
Updated Jul 15, 2026
CVE-2026-45755 in Symfony Mailtrap Mailer
Symfony Mailtrap Mailer does not verify the Mailtrap webhook signature, so a remote attacker can send fake webhook events.
Updated Jul 15, 2026
CVE-2026-13707 in MediaWiki OAuth
Session fixation vulnerability in Wikimedia Foundation OAuth. This vulnerability is associated with program files src/Backend/MWOAuthServer.Php. This issue affects OAuth: from * through 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Updated Jul 15, 2026
CVE-2026-58029 in MediaWiki
Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiChangeAuthenticationData.Php, includes/Api/ApiLinkAccount.Php, includes/Api/ApiRemoveAuthenticationData.Php, includes/Specials/SpecialLinkAccounts.Php, includes/Specials/SpecialUnlinkAccounts.Php. This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Updated Jul 15, 2026
CVE-2026-58126 in PACSgear PACS Scan
PACSgear PACS Scan 5.2.1 contains an unauthenticated remote code execution vulnerability that allows remote attackers to read and write arbitrary files by exploiting an exposed .NET Remoting TCP service on port 22222 via PGImageExchQueue.exe without any authentication requirement. Attackers can chain the arbitrary file write primitive with DLL hijacking in PGImageExchangeQueueSvc.exe, which loads missing DLLs such as CRYPTSP.DLL from the application directory, to achieve remote code execution as NT Authority\SYSTEM upon service restart.
Updated Jul 15, 2026
CVE-2026-58127 in PACSgear MediaWriter
PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requirement. By exploiting the MarshalByRefObject object unmarshalling technique and implementing .NET WebClient class methods, an unauthenticated remote attacker can read and write arbitrary files on the host filesystem. The ObjectURIs are identical across all installations by default. Chaining the arbitrary file write primitive with DLL hijacking opportunities in the MediaWriter service (which runs as NT Authority\\SYSTEM and loads missing DLLs such as CRYPTBASE.DLL from the application directory) enables unauthenticated remote code execution as SYSTEM upon service restart.
Updated Jul 15, 2026
CVE-2026-57829 in Helix Ultimate for Joomla
The Joomla extension Helix Ultimate is vulnerable to an unauthenticated stored XSS.
Updated Jul 15, 2026
CVE-2026-9571 in Mattermost Server
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680
Updated Jul 15, 2026
CVE-2026-9597 in Mattermost Server
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681
Updated Jul 15, 2026
CVE-2026-58319 in Apache Doris
Certain Apache Doris FE HTTP REST administrative APIs were accessible without proper authentication. An unauthenticated attacker with network access to the FE HTTP service could perform unauthorized administrative operations, potentially affecting cluster integrity and availability and leading to cluster instability or denial of service. This issue affects Apache Doris versions prior to 3.1.0. Users are advised to upgrade to Apache Doris 3.1.0 or later.
Updated Jul 15, 2026
CVE-2026-56164 in Microsoft SharePoint Server
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
Updated Jul 15, 2026
CVE-2026-50160 in Hoppscotch
Hoppscotch is an API development ecosystem. In self-hosted deployments of hoppscotch-backend from version 2026.4.1 and earlier, the unauthenticated POST /v1/onboarding/config endpoint is vulnerable to mass assignment. The global NestJS ValidationPipe is configured without whitelist: true, so extra properties on the request body that are not declared in SaveOnboardingConfigRequest are not stripped and are iterated in the service layer as if they were legitimate InfraConfig entries. Because keys such as JWT_SECRET and SESSION_SECRET are valid InfraConfigEnum values and are not explicitly rejected during validation, an unauthenticated attacker who can reach a fresh instance before onboarding completes (or when no users exist) can overwrite these values in the database. Overwriting JWT_SECRET gives the attacker control of the JWT signing key, allowing them to forge tokens for any user, including administrators, and results in full server compromise. The issue is fixed in hoppscotch 2026.5.0.
Updated Jul 15, 2026
CVE-2026-58517 in MediaWiki WikiLambda Extension
Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.
Updated Jul 14, 2026
CVE-2026-58593 in NodeBB
NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the sender. In the object mock, attributedTo is used directly as a uid, and actors.assert silently ignores numeric identifiers (filtering them out without re-deriving the uid), so a federated remote actor can set attributedTo to a bare numeric value such as 1 and have the resulting post or private message created with that local uid as author, including the administrator account. This lets a remote attacker forge posts and direct messages attributed to arbitrary local users. Requires the ActivityPub/federation feature to be enabled.
Updated Jul 14, 2026
CVE-2026-14381 in Google Chrome WebAppInstalls
Incorrect security UI in WebAppInstalls in Google Chrome prior to 150.0.7871.46 allowed a remote attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)
Updated Jul 14, 2026
CVE-2026-54403 in UniFi OS Server
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
Updated Jul 14, 2026
CVE-2026-54408 in UniFi Protect Application
A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi Protect Application to bypass authentication for data streaming.
Updated Jul 14, 2026
CVE-2026-54409 in UniFi Protect Application
A malicious actor with access to the network and under certain conditions could exploit an Improper Initialization vulnerability found in UniFi Protect Application to bypass authentication in UniFi Protect Cameras.
Updated Jul 14, 2026
CVE-2026-38968 ntopng Vulnerability
ntopng through 6.6 is vulnerable to Predictable Session Identifier which can lead to Session Hijacking. HTTP session identifiers in src/HTTPserver.cpp use weak time-seeded pseudo-randomness during session creation. As a result, fresh authenticated logins can receive deterministic or colliding session cookies under attacker-controlled timing.
Updated Jul 14, 2026
CVE-2026-11856 curl vulnerability
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
Updated Jul 14, 2026
CVE-2026-8927 curl vulnerability
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
Updated Jul 14, 2026
CVE-2026-45489 edge chromium vulnerability
Microsoft Edge (Chromium-based) Spoofing Vulnerability
Updated Jul 14, 2026