CVE-2026-4055

4.3 MEDIUM

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook r...

Published: 2026-05-21 · Last updated: 2026-05-21

Severity and scoring

CVSS: 4.3 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE: CWE-863

Affected products

Vendor	Product
mattermost	mattermost_server

Description

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-4055
[Vendor advisory]https://mattermost.com/security-updates

Related CVEs

Same vendor

CVE-2026-6957 — Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destin... (8.0 HIGH)
CVE-2026-4915 — Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing w... (6.5 MEDIUM)
CVE-2026-4858 — Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path trav... (8.0 HIGH)
CVE-2026-6347 — Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields in the Matter... (7.6 HIGH)
CVE-2026-6346 — Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before includ... (8.7 HIGH)

Same CWE

CVE-2026-49219 — ImageMagick is free and open-source software used for editing and manipulating digital images (5.5 MEDIUM)
CVE-2026-53738 — Copy & Delete Posts through 1.5.4 lets any plugin-enabled non-admin role invoke every operation in the cdp_action_handling AJAX handler (8.1 HIGH)
CVE-2026-49824 — Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes (8.5 HIGH)
CVE-2026-49823 — Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes (7.7 HIGH)
CVE-2026-48860 — Reliance on IP Address for Authentication vulnerability in Erlang/OTP ssl (inet_tls_dist module) allows unauthenticated bypass of the dis...