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CVE-2026-94131HighCVSS 8.3CVE published 26 September 2026Added to mySites.guru 24 September 2026

AcyMailing (com_acym) below 11.1.0 - Unauthenticated File Upload (mailbox actions, POP3 mode) and File Deletion (custom file fields)

AcyMailing 11.1.0 (24 Sep 2026) fixes two security issues that affect the Enterprise edition; Starter installs contain the same code but cannot reach either feature. 1) CVE-2026-94132 (CVSS 4.0 9.5 Critical): mailbox actions and bounce handling using the POP3 (non-IMAP, "pear") connection method saved MIME parts from an incoming email to media/com_acym/upload/ without checking their extension against the allowed-files list, so anyone able to email the monitored mailbox could write a file of any type, including PHP, into the web root (remote code execution). 2) CVE-2026-94131 (CVSS 4.0 8.3 High): before 11.1.0 a subscriber could post a plain string as the value of a file-type custom field instead of uploading a file, and clearing that field later deleted the stored path without checking it stayed inside the upload folder, allowing path traversal to arbitrary file deletion (for example configuration.php). Both CVEs were published by the Joomla CNA on 26 Sep 2026. Update to 11.1.0 or later. Temporary mitigation: remove file-type custom fields from public forms and switch the mailbox connection method to IMAP.

Is my site affected?

Affected
AcyMailing before 11.1.0
Fixed in
11.1.0
What to do
Update AcyMailing to 11.1.0 or later.
Check whether your sites are affected

How CVE-2026-94131 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.

8.3 High

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/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:P Attack requirements
Present. Needs a particular deployment or race to line up
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:N Confidentiality
None. Nothing can be read
VI:H Integrity
High. Data and files can be altered at will
VA:H Availability
High. The site can be taken down

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

The rule below is rated Critical for the set of 2 CVEs it covers together, not for this record on its own.

Timeline

  1. 24 September 2026mySites.guru check added for AcyMailing (before 11.1.0)
  2. 24 September 2026We published: AcyMailing 11.1.0 Fixes Two Security Flaws
  3. 26 September 2026CVE-2026-94131 record published by its CNA

Rule details

Our disclosure post

AcyMailing 11.1.0 Fixes Two Security Flaws

AcyMailing 11.1.0 Fixes Two Security Flaws

AcyMailing 11.1.0 fixes a mailbox file write and a file deletion flaw, now CVE-2026-94132 (9.5 Critical) and CVE-2026-94131, both filed under Bug fixes.

Other vulnerabilities in AcyMailing

Updating for CVE-2026-94131 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

AcyMailing

Latest safe version: 11.1.0

References

CVE-2026-94131 questions

Which versions are affected by CVE-2026-94131?
CVE-2026-94131 affects AcyMailing before 11.1.0. The fix is in 11.1.0.
How do I fix CVE-2026-94131?
Update AcyMailing to 11.1.0 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-94131?
Joomla CNA scores it 8.3 (High) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

Running an affected version on a site you manage?

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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 17 October 2026.