CVE-2026-65762 Phoca Guestbook extension for Joomla vulnerability

Who is affected

How to fix it

CVE-2026-65762 affects Phoca Guestbook extension for Joomla and involves cross-site scripting. Successful exploitation may run attacker-controlled script in a trusted user's browser and expose session or application data. Prioritize deployments that process untrusted input, expose the affected feature, or hold sensitive data. No confirmed fixed version is recorded for CVE-2026-65762; follow the linked vendor advisory, apply its mitigation, and update Phoca Guestbook extension for Joomla as soon as a supported patched release is available.

1. Inventory every deployment, device, package, plugin, container, build, and environment that uses Phoca Guestbook extension for Joomla.
2. Compare the installed version with the recorded affected range: 5.0.0-6.1.0.
3. No confirmed fixed version is recorded for CVE-2026-65762; follow the linked vendor advisory, apply its mitigation, and update Phoca Guestbook extension for Joomla as soon as a supported patched release is available.
4. Until patched, disable the affected Phoca Guestbook extension for Joomla feature or plugin and restrict its public and administrator endpoints.
5. Review configuration, roles, tokens, network paths, and exposed endpoints connected to Phoca Guestbook extension for Joomla; remove access that is not required.
6. Review submissions, stored content, administrator activity, CSP reports, and web logs for script payloads or suspicious browser requests.
7. 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.

Verify the fix

• Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-65762 in place.
• Use a safe regression test to confirm the affected cross-site scripting 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

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More published guidance from the same primary category.

Trusted references

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