CVE-2026-4054
Published: May 15, 2026
Modified: May 15, 2026
CVSS v3.1
4.3
Description
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
| Vendor | Product | Versions |
|---|---|---|
Mattermost | Mattermost | affected 11.5.0 - <= 11.5.1affected 10.11.0 - <= 10.11.13affected 11.4.0 - <= 11.4.3unaffected 11.6.0unaffected 11.5.2+2 more versions |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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