CVE-2026-4054
🔶 mediumSummary
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)