{"id":"EUVD-2026-29328","revision":"27426ad6dd93410593b36d39302efbd8","records":[{"revision":"27426ad6dd93410593b36d39302efbd8","observedAt":"2026-10-30T06:58:25.526+00:00","statement":{"source":"euvd","id":"EUVD-2026-29328","aliases":["CVE-2026-42554","GHSA-qjv7-627w-8qjv"],"title":"Fiber is a web framework for Go. Prior to 2.52.12 and 3.1.0, Cross-Site Scripting vulnerability in Go Fiber allows a remote attacker to inject arbitrary HTML/JavaScript by supplying Accept: text/html on any request whose handler passes atta…","description":"Fiber is a web framework for Go. Prior to 2.52.12 and 3.1.0, Cross-Site Scripting vulnerability in Go Fiber allows a remote attacker to inject arbitrary HTML/JavaScript by supplying Accept: text/html on any request whose handler passes attacker-influenced data to the AutoFormat() feature. The developer opts into content negotiation by calling AutoFormat(), but does not opt into raw HTML emission for a particular request; Fiber chooses that branch from attacker-controlled Accept. The html branch is the sole outlier in a method whose name (AutoFormat) and symmetrical structure actively telegraph \"safe, format-agnostic reply.\" This vulnerability is fixed in 2.52.12 and 3.1.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.3,"severity":null}],"references":["https://github.com/gofiber/fiber/security/advisories/GHSA-qjv7-627w-8qjv"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-29328","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 11, 2026, 9:47:17 PM","dateUpdated":"May 15, 2026, 6:24:38 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-29328","identifiers":["EUVD-2026-29328","CVE-2026-42554","GHSA-qjv7-627w-8qjv"]},"retained":false,"historicalAffected":[]}],"coverage":[]}