CVE-2026-116516 PUBLISHED

Insufficient length validation when parsing Zoom chat transcriptions

Assigner: Mattermost
Reserved: 26.10.2026 Published: 26.10.2026 Updated: 26.10.2026

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

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from <=11.9 11.1.9 11.5.8 11.10.7.0 to <=11.9 11.1.9 11.5.8 11.10.7.0 (incl.) Version 11.10.0 is unaffected Version 11.9.2 is unaffected Version 11.8.6 is unaffected Version 11.7.11 is unaffected

Solutions

Update Mattermost to versions 11.10.0, 11.9.2, 11.8.6, 11.7.11 or higher.

Credits

alimursaliyev finder

References

MMSA-2026-00723

Problem Types

CWE-754: Improper Check for Unusual or Exceptional Conditions CWE