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CVE-2026-118495HighCVSS 8.8CVE published 12 November 2026Added to mySites.guru 12 November 2026

AcyMailing (com_acym) below 11.1.2 - Unauthenticated Subscriber Key Disclosure, Forced Unsubscribe, Campaign and List Disclosure, Module Access Bypass and Open Redirect

AcyMailing 11.1.2 (12 Nov 2026) fixes seven CVEs published by the Joomla CNA the same day. Six were found and privately reported to Acyba by mySites.guru (Phil Taylor); CVE-2026-118495 was reported through the Ghent University VDP. 1) CVE-2026-118495 (CVSS 4.0 8.8 High, AcyMailing 6.0.0 to 11.1.1): an unauthenticated attacker who knows a subscriber's email address can read that subscriber's record, including the secret key that authorises the subscription management links, and then act as that subscriber, including triggering the GDPR data export or account deletion where enabled. 2) CVE-2026-120466 (8.8 High): an unauthenticated request naming a known email address unsubscribes that subscriber from one list or every list with no ownership proof, and reveals whether the address is subscribed. 3) CVE-2026-120467 (7.1 High): a logged-in user of any level can subscribe or unsubscribe any other subscriber. 4) CVE-2026-120470 (6.9 Medium): anyone can read the online version of campaigns never made public, including campaigns unpublished after sending or sent to a restricted audience. 5) CVE-2026-120468 (6.9 Medium, Joomla only): anonymous listing of every mailing list, including invisible and access-restricted ones, with descriptions, owners and subscriber counts. 6) CVE-2026-120471 (6.9 Medium, Joomla only): the ajax module loader renders access-restricted site modules to guests. 7) CVE-2026-120469 (5.1 Medium): open redirect after subscribe or unsubscribe on a default configuration. No remote code execution or SQL injection. Update to 11.1.2 or later. Until then, set 'Allow subscriber data modifications without authentication' to 'No'. A site that lost its AcyMailing update site will not be offered 11.1.2 by Joomla; reinstall the package.

Is my site affected?

Affected
AcyMailing before 11.1.2
Fixed in
11.1.2
What to do
Update AcyMailing to 11.1.2 or later.
Check whether your sites are affected

How CVE-2026-118495 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.

8.8 High

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/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: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:L Integrity
Low. Some data can be altered
VA:N Availability
None. The site stays up

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. 12 November 2026CVE-2026-118495 record published by its CNA
  2. 12 November 2026mySites.guru check added for AcyMailing (before 11.1.2)
  3. 12 November 2026We published: AcyMailing 11.1.2 Fixes Seven Front-End Security Flaws We Reported

Rule details

Our disclosure post

AcyMailing 11.1.2 Fixes Seven Front-End Security Flaws We Reported

AcyMailing 11.1.2 Fixes Seven Front-End Security Flaws We Reported

AcyMailing 11.1.2 fixes seven flaws mySites.guru reported in the Joomla extension, led by a forced unsubscribe rated 8.8 High. The CVEs are now published.

Other vulnerabilities in AcyMailing

Updating for CVE-2026-118495 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: 11.1.2

All 15 CVEs in AcyMailing

References

CVE-2026-118495 questions

Which versions are affected by CVE-2026-118495?
CVE-2026-118495 affects AcyMailing before 11.1.2. The fix is in 11.1.2.
How do I fix CVE-2026-118495?
Update AcyMailing to 11.1.2 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-118495?
Joomla CNA scores it 8.8 (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 12 November 2026.