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CVE-2026-65762MediumCVSS 5.1CVE published 23 July 2026Added to mySites.guru 23 July 2026

Phoca Guestbook (com_phocaguestbook) <= 6.1.0 - Unauthenticated Reflected XSS

Phoca Guestbook by phoca.cz is affected by a reflected cross-site scripting vulnerability (CVE-2026-65762): improper validation of user input in the front-end guestbook reflects attacker-controlled script into the response. Affects all versions 1.0.0 through 6.1.0; update to 6.1.1 or later.

Is my site affected?

Affected
Phoca Guestbook up to and including 6.1.0
Fixed in
Update to 6.1.1 or later
What to do
Update Phoca Guestbook to 6.1.1 or later.
Check whether your sites are affected

How CVE-2026-65762 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

5.1 Medium

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:N Attack requirements
None. Works against any affected install
PR:N Privileges required
None. No account needed
UI:A User interaction
Active. Someone has to be talked through a few steps

What it does to the site

VC:L Confidentiality
Low. Some data can be read
VI:L Integrity
Low. Some data can be altered
VA:L Availability
Low. The site slows or stutters

What it does beyond the site

SC:N Confidentiality
None. Other systems keep their data
SI:N Integrity
None. Other systems keep their integrity
SA:N Availability
None. Other systems stay up

Timeline

  1. 23 July 2026CVE-2026-65762 record published by its CNA
  2. 23 July 2026mySites.guru check added for Phoca Guestbook (up to and including 6.1.0)

Rule details

Other vulnerabilities in Phoca Guestbook

Updating for CVE-2026-65762 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

Phoca Guestbook

Latest safe version: 6.1.1

References

CVE-2026-65762 questions

Which versions are affected by CVE-2026-65762?
CVE-2026-65762 affects Phoca Guestbook up to and including 6.1.0.
How do I fix CVE-2026-65762?
Update Phoca Guestbook to 6.1.1 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-65762?
Joomla CNA scores it 5.1 (Medium) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and someone has to be talked through a few steps.

Running an affected version on a site you manage?

A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, fix.mysites.guru is a single fixed fee per incident, usually resolved the same day.

This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 5 October 2026.