CVE-2026-63770 glance vulnerability
Glance through 0.8.5 contains an IP address spoofing vulnerability in the authentication handler that allows unauthenticated attackers to bypass brute-force lockout protections by supplying arbitrary values in the X-Forwarded-For request header when the server proxied option is enabled. Attackers can manipulate the leftmost value of the X-Forwarded-For header to make each login attempt appear to originate from a distinct IP address, preventing the per-IP failed-login counter from reaching the lockout threshold and enabling unlimited credential guessing against the authentication endpoint.
Browse Input Validation security risksQuick answer
glanceapp glance should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- <= 0.8.5
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-63770 affects glance and involves authentication bypass. Successful exploitation may let an attacker bypass an expected login or multi-factor authentication check. Treat this as a high-priority fix, especially when the affected component or endpoint is reachable by untrusted users. No confirmed fixed version is recorded for CVE-2026-63770; follow the linked vendor advisory, apply its mitigation, and update glance as soon as a supported patched release is available.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses glance.
- Compare the installed version with the recorded affected range: <= 0.8.5.
- No confirmed fixed version is recorded for CVE-2026-63770; follow the linked vendor advisory, apply its mitigation, and update glance as soon as a supported patched release is available.
- Until patched, restrict the affected API or workflow to trusted administrators and enforce an additional access-control layer at the proxy or network boundary.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to glance; remove access that is not required.
- Review authentication, API, audit, and object-change logs for cross-user access, bypassed checks, or unexpected privileged actions.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
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Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-63770 in place.
- Use a safe regression test to confirm the affected authentication bypass path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-63770?
glanceapp glance versions listed as affected should be reviewed: <= 0.8.5.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.