CVE-2026-9571
🔶 mediumSummary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680
CVSS Score
5.9
Medium
EPSS Score
0.2
Exploit Probability
Published Date
2026-07-13
First Seen: 2026-07-14
📊 Relative Risk Intelligence
This CVE is Lower Risk - more severe than 33.1% of all 338,292 vulnerabilities in our database.
#226,150
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jul 14, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
🏆 Discovered By
kirs112
SSVC data provided by
CISA
Last Modified
2026-07-15
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE IDs (Weakness Types)