{"id":"GO-2026-5454","summary":"Mattermost doesn't validate the response body of proxied images in github.com/mattermost/mattermost-server","details":"Mattermost doesn't validate the response body of proxied images in github.com/mattermost/mattermost-server","aliases":["CVE-2026-4054","GHSA-j76w-p754-g2w7"],"modified":"2026-06-25T23:01:17.183161047Z","published":"2026-06-25T22:34:31Z","database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-5454","review_status":"UNREVIEWED"},"references":[{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-j76w-p754-g2w7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4054"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-20250731163400-5b955468ea1e"},{"fixed":"0.0.0-20260414103857-b21ef302025e"},{"introduced":"11.4.0+incompatible"},{"fixed":"11.4.4+incompatible"},{"introduced":"11.5.0+incompatible"},{"fixed":"11.5.2+incompatible"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-5454.json"}}],"schema_version":"1.7.5"}