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CVE-2026-4858

⚠️ high
🔍 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 check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640

CVSS Score
8.0
High
EPSS Score
0.3
Exploit Probability
Published Date
2026-05-21
First Seen: 2026-05-22
📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 76.7% of all 365,646 vulnerabilities in our database.

#85,366
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 21, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
🏆 Discovered By
daw10
SSVC data provided by CISA
Last Modified 2026-07-23
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-22

📦 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
v11.6.0

🔗 References 1

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

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-95666 🔶 medium 4.3 0.4 Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to limit the length o... 2026-09-22
CVE-2026-96259 🔶 medium 5.5 0.3 Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to apply the internal... 2026-09-22
CVE-2026-96260 🔶 medium 6.5 0.4 Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to enforce a request ... 2026-09-22
CVE-2026-10542 🔶 medium 5.0 0.1 Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel a... 2026-09-14
CVE-2026-10556 🔶 medium 5.3 0.3 Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate null entr... 2026-09-14
CVE-2026-11993 🔶 medium 4.3 0.2 Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to properly enforce t... 2026-09-14
These CVEs affect the same products