All vulnerabilities
CVE-2026-116516

Mattermost: Insufficient length validation when parsing Zoom chat transcriptions

Mattermost MattermostApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published26 Oct 2026Updated 26 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Mattermost versions <=11.9 11.1.9 11.5.8 11.10.7.0 fail to validate Zoom chat line length before slicing which allows an authenticated attacker to crash the Agents plugin via summarizing a Zoom chat transcription containing short continuation lines. Mattermost Advisory ID: MMSA-2026-00723

Text from CVE List

Affected versions 5

  • Mattermostaffected: <=11.9 11.1.9 11.5.8 11.10.7.0 through <=11.9 11.1.9 11.5.8 11.10.7.0CVE List
  • Mattermostunaffected: 11.10.0CVE List
  • Mattermostunaffected: 11.9.2CVE List
  • Mattermostunaffected: 11.8.6CVE List
  • Mattermostunaffected: 11.7.11CVE List

References 1