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CVE-2026-4635

🔶 medium
🔍 Scan for this CVE
Summary

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637

CVSS Score
6.5
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-22
First Seen: 2026-05-27
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 47.7% of all 336,041 vulnerabilities in our database.

#175,688
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 22, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
daw10
SSVC data provided by CISA
Last Modified 2026-05-22
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE IDs (Weakness Types)
CWE-362

📦 Affected Products 4

Vendor Product Status Affected Versions
mattermost mattermost_server Affected
> 10.11.0 < 10.11.15
mattermost mattermost_server Affected
> 11.4.0 < 11.4.5
mattermost mattermost_server Affected
> 11.5.0 < 11.5.4
mattermost mattermost_server Affected
> 11.6.0 < 11.6.1

🔗 References 1

https://mattermost.com/security-updates
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-10085 🔶 medium 5.4 0.2 Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict the group_constrained chann... 2026-07-13
CVE-2026-10103 🔶 medium 4.3 0.2 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 ... 2026-07-13
CVE-2026-10106 🔶 medium 6.5 0.2 Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced i... 2026-07-13
CVE-2026-6850 🔶 medium 6.5 0.2 Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of m... 2026-07-13
CVE-2026-9571 🔶 medium 5.9 0.2 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... 2026-07-13
CVE-2026-9597 🔶 medium 5.4 0.1 Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before crea... 2026-07-13
These CVEs affect the same products