CVE-2026-10103
EUVD-2026-4330713.07.2026, 09:16
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-2026-00689Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 ≤ 𝑥 < 10.11.20 |
| mattermost | mattermost_server | 11.6.0 ≤ 𝑥 < 11.6.5 |
| mattermost | mattermost_server | 11.7.0 ≤ 𝑥 < 11.7.3 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 11.7.0 ≤ 𝑥 ≤ 11.7.2 | CNA |
| mattermost | mattermost | 11.6.0 ≤ 𝑥 ≤ 11.6.4 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.19 | CNA |
Common Weakness Enumeration
Vulnerability Media Exposure
References