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CVE-2026-4054

🔶 medium
🔍 Scan for this CVE
Summary

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to validate the response body of proxied images, which allows a remote attacker to enact client-side DoS via an SVG file served from an attacker-controlled origin under a non-SVG Content-Type header (e.g. image/png) embedded in an og:image meta tag or Markdown image link.. Mattermost Advisory ID: MMSA-2026-00630

CVSS Score
4.3
Medium
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-15
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 5.3% of all 348,756 vulnerabilities in our database.

#330,126
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 15, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
mk7120
SSVC data provided by CISA
Last Modified 2026-05-18
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CWE IDs (Weakness Types)
CWE-754

📦 Affected Products 3

Vendor Product Status Affected Versions
mattermost mattermost_server Affected
> 10.11.0 < 10.11.14
mattermost mattermost_server Affected
> 11.4.0 < 11.4.4
mattermost mattermost_server Affected
> 11.5.0 < 11.5.2

🔗 References 1

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

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-10527 🔶 medium 6.3 0.2 Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a ... 2026-08-17
CVE-2026-15754 🔶 medium 4.2 0.2 Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate ... 2026-08-17
CVE-2026-16044 🔶 medium 5.4 0.2 Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privile... 2026-08-17
CVE-2026-16045 🔶 medium 4.3 0.2 Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 Mattermost failed to restrict OAuth deauthorization and person... 2026-08-17
CVE-2026-16046 🔶 medium 4.3 0.2 Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to enforce run-state validation on write operations for f... 2026-08-17
CVE-2026-16047 🔶 medium 4.3 0.2 Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate that users have read access... 2026-08-17
These CVEs affect the same products