CVE-2026-10600 PUBLISHED

Denial of service via unbounded document content extraction in Mattermost Server

Assigner: Mattermost
Reserved: 02.06.2026 Published: 27.07.2026 Updated: 27.07.2026

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

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 4.3

Product Status

Vendor Mattermost
Product Mattermost
Versions Default: unaffected
  • affected from 11.8.0 to 11.8.0 (incl.)
  • affected from 11.7.0 to 11.7.3 (incl.)
  • affected from 11.6.0 to 11.6.5 (incl.)
  • affected from 10.11.0 to 10.11.20 (incl.)
  • Version 11.9.0 is unaffected
  • Version 11.8.1 is unaffected
  • Version 11.7.4 is unaffected
  • Version 11.6.6 is unaffected
  • Version 10.11.21 is unaffected

Solutions

Update Mattermost to versions 11.9.0, 11.8.1, 11.7.4, 11.6.6, 10.11.21 or higher.

Credits

  • abderrahimelkahlaoui finder

References

Problem Types

  • CWE-770: Allocation of Resources Without Limits or Throttling CWE