CVE-2026-10600Network attack vector

File-upload disruption via unbounded document extraction

Published Jul 27, 2026 · Updated Jul 27, 2026

Resource exhaustion in affected Mattermost Server versions allows remote authenticated users to degrade file uploads for all users. The server-side document content extractor applies no time or resource bound to small, expensive-to-extract documents, letting repeated uploads saturate the shared worker pool. File-upload permission is required; affected releases are 10.11.0 through 10.11.20, 11.6.0 through 11.6.5, 11.7.0 through 11.7.3, and 11.8.0.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in affected Mattermost Server versions allows remote authenticated users to degrade file uploads for all users. The server-side document content extractor applies no time or resource bound to small, expensive-to-extract documents, letting repeated uploads saturate the shared worker pool. File-upload permission is required; affected releases are 10.11.0 through 10.11.20, 11.6.0 through 11.6.5, 11.7.0 through 11.7.3, and 11.8.0.

The record

CVE
CVE-2026-10600
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-770, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.11.0 <=10.11.20
  2. Affected versionversion=11.6.0 <=11.6.5
  3. Affected versionversion=11.7.0 <=11.7.3
  4. Affected versionversion=11.8.0 <=11.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=10.11.0 <=10.11.20; version=11.6.0 <=11.6.5; version=11.7.0 <=11.7.3; version=11.8.0 <=11.8.0

Published CVSS scores

4.3Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo