Skip to content
TrackCVE
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2026-13417

Boards plugin denial of service via unvalidated block fields.properties

Medium4.3EPSS 0.37%
Published
Updated
Reserved
Assigned by
Mattermost

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate the type of `fields.properties` on block creation which allows an authenticated user with editor access to a board to crash the Boards plugin worker and trigger a denial of service via a child block whose `fields.properties` is a non-object value. Mattermost Advisory ID: MMSA-2026-00710

Timeline

  1. ID reserved

    By Mattermost

  2. · 3 months later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-13417, by who scored it
Scored byCVSSScoreVector
MattermostCNA (assigner)3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Analyzed3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS (exploitation in 30 days)
0.37% · top 69% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

Affected products

  • Mattermost · Mattermost

    • affected 11.9.0 – ≤ 11.9.0
    • affected 11.8.0 – ≤ 11.8.4
    • affected 11.7.0 – ≤ 11.7.7
    • affected 10.11.0 – ≤ 10.11.22
    • unaffected 11.10.0
    • unaffected 11.9.1
    • unaffected 11.8.5
    • unaffected 11.7.8
    • unaffected 10.11.23

What to do

Solution: Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-13417 badge
[![CVE-2026-13417](https://trackcve.app/badge/CVE-2026-13417.svg)](https://trackcve.app/cve/CVE-2026-13417)

Record last updated .