Medium 6.5Published Oct 26, 2026

CVE-2026-116516Insufficient length validation when parsing Zoom chat transcriptions

Updated under an hour ago (Oct 29, 2026, 10:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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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

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-754
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Mattermost
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

Mattermost Mattermost mattermost:mattermost (from the name)	from <=11.9 11.1.9 11.5.8 11.10.7.0 through <=11.9 11.1.9 11.5.8 11.10.7.0; 11.10.0 not affected; 11.9.2 not affected; 11.8.6 not affected; 11.7.11 not affected	CNA record

References

References

https://mattermost.com/security-updates	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.