Improper Check for Unusual or Exceptional Conditions Affecting github.com/mattermost/mattermost/server/v8/platform/services/imageproxy package, versions >=10.11.0-rc1 <10.11.14>=11.4.0-rc1 <11.4.4>=11.5.0-rc1 <11.5.2-rc1>=11.6.0-rc1 <11.6.0-rc2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERV8PLATFORMSERVICESIMAGEPROXY-16723388
- published17 May 2026
- disclosed15 May 2026
- creditUnknown
Introduced: 15 May 2026
CVE-2026-4054 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/v8/platform/services/imageproxy to version 10.11.14, 11.4.4, 11.5.2-rc1, 11.6.0-rc2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Check for Unusual or Exceptional Conditions via the image proxy process. An attacker can cause a denial of service on client systems by serving malicious SVG files from an attacker-controlled origin with a misleading Content-Type header, such as image/png, embedded in an og:image meta tag or Markdown image link.