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CVE-2026-14344

Inconsistent authorization checks in Mattermost Boards endpoints

Medium4.3EPSS 0.25%
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 enforce the board-creation permission which allows an unauthorized authenticated user to create boards via the board duplicate, boards-and-blocks, and archive-import endpoints.. Mattermost Advisory ID: MMSA-2026-00715

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-2026-14344, 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:L/A:N
NVDNVD · Analyzed3.1Medium4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.25% · top 83% 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.

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Record last updated .