Medium 4.3Published Jul 27, 2026

CVE-2026-10600Denial of service via unbounded document content extraction in Mattermost Server

Updated under an hour ago (Oct 27, 2026, 2:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for Mattermost

Exploited in the last 30 days

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade file uploads for all users on the server via repeatedly uploading small documents that are cheap to upload but expensive to extract, saturating the shared extraction worker pool.. Mattermost Advisory ID: MMSA-2026-00694

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-770
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: Analyzed
Record last updated: Jul 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mattermost Mattermost mattermost:mattermost (from the name)	from 11.8.0 through 11.8.0; from 11.7.0 through 11.7.3; from 11.6.0 through 11.6.5; from 10.11.0 through 10.11.20; 11.9.0 not affected; 11.8.1 not affected; 11.7.4 not affected; 11.6.6 not affected; and 1 more ranges	CNA record
mattermost mattermost_server mattermost:mattermost_server	from 10.11.0 before 10.11.21; from 11.6.0 before 11.6.6; from 11.7.0 before 11.7.4; from 11.8.0 before 11.8.1	NVD

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.