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CVE-2026-9708

MEDIUM
4.9
CVSS 3.1
Description
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683

Metadata

CVE ID
CVE-2026-9708
State
PUBLISHED
Assigner
Mattermost
Reserved
2026-05-27 13:46 UTC
Published
2026-07-13 08:00 UTC
Last updated
2026-07-13 08:00 UTC
Primary CWE
CWE-639
CWE-639: Authorization Bypass Through User-Controlled Key
Vendor / Product
Mattermost / Mattermost
Sources
cve.org  ·  NVD

Severity & Metrics

4.9 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
Mattermost Mattermost — 11.7.0 ≤ 11.7.2, 11.6.0 ≤ 11.6.4, 10.11.0 ≤ 10.11.19, 11.8.0 …
Weakness (CWE)
CWESourceDescription
CWE-639 cna CWE-639: Authorization Bypass Through User-Controlled Key
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.9 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
References (1)
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