CVE-2026-10103
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync
CVSS
4.3
Medium
EPSS
0.1%
p4
KEV
—
Exploit Today
1
0-100
Published: Jul 13, 2026 · Last modified: Jul 14, 2026 · CWE-639
0.1%EPSS · 30 days0.1%
2026-07-132026-07-16
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing arbitrary post IDs in channels shared with that remote.. Mattermost Advisory ID: MMSA-2026-00689
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-552558.4 HIG42.8%
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