Gogs: Stored XSS in branch and wiki views through author and committer names
Date: 2026-03
Affected: go/gogs.io/gogs
Attack vector: xss
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2026-25921
CVE-2026-26022
CVE-2026-26195
CWE: CWE-345
CWE-79
CVSS:  (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N)

### Summary Stored XSS is still possible through unsafe template rendering that mixes user input with `safe()` plus permissive sanitizer handling of data URLs. ### Details `safe()` still turns off escaping: - internal/template/template.go - `func safe(raw string) template.HTML { return template.HTML(raw) }` Branch pages still render committer names using `safe()`: - templates/repo/branches/overview.tmpl - templates/repo/branches/all.tmpl - templates/repo/wiki/view.tmpl The locale still injects a raw second argument: conf/locale/locale_en-US.ini (`branches.updated_by = updated %[1]s by %[2]s`) ### Impact An attacker who can inject commit metadata such as author/committer name can trigger script execution on affected pages, leading to session abuse, CSRF token theft, or unauthorized actions. ### Recommended Fix - Untrusted arguments should be escaped before being used in translations. - Data URLs should be limited or blocked in the sanitizer. ### Remediation A fix is available at https://github.com/gogs/gogs/releases/tag/v0.14.2.


Mitigations:

Architectural layers (MAESTRO):