Insufficient length validation when parsing Zoom chat transcriptions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116516
StatePUBLISHED
AssignerMattermost
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-26 14:16:37 UTC
Updated2026-10-26 16:50:49 UTC
DescriptionMattermost 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

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-754 | CWE-754 CWE-754: Improper Check for Unusual or Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mattermost Mattermost affected <=11.9 11.1.9 11.5.8 11.10.7.0 <=11.9 11.1.9 11.5.8 11.10.7.0 semver Not specified
CNA Mattermost Mattermost unaffected 11.10.0 Not specified
CNA Mattermost Mattermost unaffected 11.9.2 Not specified
CNA Mattermost Mattermost unaffected 11.8.6 Not specified
CNA Mattermost Mattermost unaffected 11.7.11 Not specified

References

ReferenceSourceLinkTags
mattermost.com/security-updates [email protected] mattermost.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: alimursaliyev (en)

Additional Advisory Data

Solutions

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

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