Affected versions: < 11.1.0
Full advisory: www.acymailing.com · our disclosure post
CVE-2026-94131HighCVSS 8.3Published 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.
Affected versions: < 11.1.0
Official record: cve.org · NVD
Every connected Joomla site is checked against this rule on each audit, and flagged if it runs an affected version.
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 CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:NHow 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.
Affected extensions and versions
Our disclosure post
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Rules current as of 28 September 2026.