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CriticalA PHP security release fixes two CVSS 9.2 flaws, and PHP 8.1 and older get no patchWhat it means for your site
CVE-2026-88852HighCVSS 7.5CVE published 14 September 2026Added to mySites.guru 13 September 2026

Snippets (snippets) 10.0.0 to below 11.0.0 - Authenticated Stored XSS via Snippet Variable Overrides

Regular Labs Snippets 10.0.0 through 10.0.6 is affected by CVE-2026-88852, fixed in 11.0.0 (released 13 September 2026). Snippet variable overrides could be set by any user able to author content, letting a lower-privileged author change the values a snippet renders and inject script through them. 11.0.0 restricts variable overrides to selected article author groups by default. Exploitation requires the ability to author or edit content containing Snippets tags, so this is an authenticated stored XSS. Update to 11.0.0 or later. Note that 11.0.0 is flagged by the vendor as a BC BREAK: the restriction is enabled by default and has to be re-opened deliberately per author group, so any site relying on variable overrides should review those settings after updating. The CVE record was published on 14 September 2026 with a CVSS 4.0 base score of 7.5 (High), vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU:N.

Is my site affected?

CVE-2026-88852 is checked by 2 rules. Find the extension and release line your site runs:

ExtensionAffected versionsFixed inWhat to do
Snippetsfrom 10.0.0 up to but not including 11.0.011.0.0Update Snippets to 11.0.0 or later.
Snippetsfrom 1.0.0 up to but not including 7.0.07.0.0Update Snippets to 7.0.0 for this flaw, or to 11.0.0 or later, which no rule we check matches.
Check whether your sites are affected

How CVE-2026-88852 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.

7.5 High

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU: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:P Attack requirements
Present. Needs a particular deployment or race to line up
PR:H Privileges required
High. Needs an account with elevated rights
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
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. 13 September 2026mySites.guru check added for Snippets (from 10.0.0 up to but not including 11.0.0)
  2. 13 September 2026mySites.guru check added for Snippets (from 1.0.0 up to but not including 7.0.0)
  3. 14 September 2026CVE-2026-88852 record published by its CNA

Rule details

HighCVE-2026-888522026-09-13

Snippets - Snippets (snippets) 1.0.0 to below 7.0.0 - Authenticated Stored XSS via Snippet Variable Overrides

Regular Labs Snippets 1.0.0 through 6.9.4 is affected by CVE-2026-88852. Snippet variable overrides could be set by any user able to author content, letting a lower-privileged author change the values a snippet renders and inject script through them. The Free edition stopped being affected at 7.0.0; the Pro edition remained affected through 10.0.6 and was fixed in 11.0.0 (released 13 September 2026), which is covered by a separate rule. Exploitation requires the ability to author or edit content containing Snippets tags, so this is an authenticated stored XSS. Update to 11.0.0 or later, the current release for both editions, and note that 11.0.0 is flagged by the vendor as a BC BREAK: variable overrides are restricted to selected article author groups by default and have to be re-opened deliberately, so any site relying on them should review those settings after updating. The CVE record was published on 14 September 2026 with a CVSS 4.0 base score of 7.5 (High), vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU:N.

Affected versions: ≥ 1.0.0 and < 7.0.0

Full advisory: regularlabs.com

Other vulnerabilities in Snippets and Snippets

Updating for CVE-2026-88852 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extensions.

Snippets

Latest safe version: 11.0.0

Snippets

Latest safe version: 11.0.0

References

CVE-2026-88852 questions

Which versions are affected by CVE-2026-88852?
CVE-2026-88852 is covered by 2 rules: Snippets from 10.0.0 up to but not including 11.0.0; Snippets from 1.0.0 up to but not including 7.0.0.
How do I fix CVE-2026-88852?
It depends on the extension and release line your site runs. For Snippets from 10.0.0 up to but not including 11.0.0: update Snippets to 11.0.0 or later. For Snippets from 1.0.0 up to but not including 7.0.0: update Snippets to 7.0.0 for this flaw, or to 11.0.0 or later, which no rule we check matches.
How severe is CVE-2026-88852?
Joomla CNA scores it 7.5 (High) under CVSS 4.0. In plain terms: reachable across the internet, needs an account with elevated rights and nobody has to be tricked into anything.

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 23 October 2026.