CVE-2026-3637
🔶 mediumSummary
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627
CVSS Score
4.3
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-18
First Seen: 2026-05-19
📊 Relative Risk Intelligence
This CVE is Lower Risk - more severe than 5.4% of all 327,350 vulnerabilities in our database.
#309,612
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 18, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
0x7oda7123
SSVC data provided by
CISA
Last Modified
2026-05-19
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE IDs (Weakness Types)