# CVE-2026-25119: Gogs authentication bypass via spoofed reverse proxy headers

Source: https://junglewise.ai/threats/cve-2026-25119-gogs-authentication-bypass-via-spoofed-reverse-proxy-headers  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-24. Updated: 2026-06-24  
License: CC BY 4.0 with a link back

CVE-2026-25119 · Severity: high · CVSS 4 · Published 2026-06-24

Gogs, an open-source self-hosted Git service, contains a vulnerability that allows attackers to bypass login requirements. When a specific "reverse proxy authentication" setting is enabled, the system trusts identity information sent in web headers without verifying if they came from a legitimate security gateway. An attacker can exploit this to impersonate any user, including administrators, or automatically create new accounts, potentially leading to a full takeover of the Git service and its hosted source code.

Technologies: [gogs.io/gogs (Go)](https://junglewise.ai/threats/technologies/gogs-io-gogs), [Gogs](https://junglewise.ai/threats/technologies/gogs). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Gogs](https://junglewise.ai/threats/vendors/gogs).

## Quick answers

**Is CVE-2026-25119 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25119 being exploited in the wild.

**How severe is CVE-2026-25119?** High severity, with a CVSS score of 4, published 24 June 2026.

**Which products and versions are affected?** gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.

**Is there a fix for CVE-2026-25119?** Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-25119 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-25119?** Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- gogs.io/gogs (Go): upgrade to 0.14.3 or later

  ```sh
  go get gogs.io/gogs@v0.14.3
  ```


## Technical details

Gogs prior to version 0.14.3 fails to validate the source of authentication headers when `ENABLE_REVERSE_PROXY_AUTHENTICATION` is active. The application reads the identity header (defaulting to `X-WEBAUTH-USER`) directly from the incoming HTTP request without verifying that the request originated from a trusted reverse proxy. A remote attacker can forge this header to bypass authentication entirely, impersonate any existing user (including admins), or trigger automatic account creation if `ENABLE_REVERSE_PROXY_AUTO_REGISTRATION` is also enabled. The fix in version 0.14.3 introduces the `TRUSTED_PROXY_IPS` configuration option to restrict header acceptance to known, authorized IP addresses.

## Affected products

- Gogs Gogs < 0.14.3

## Identifiers

- CVE-2026-25119
- GHSA-w6j9-vw59-27wv
- GO-2026-5695

## Timeline

- 2026-05-18: patched: Fix merged into main branch
- 2026-06-07: other: Release 0.14.3 published
- 2026-06-19: advisory: GitHub Security Advisory published
- 2026-06-24: disclosed: CVE published to NVD

## References

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

## Related threats

- [Gogs Git Smart HTTP authorization bypass](https://junglewise.ai/threats/cve-2026-123012-in-gogs-0-14-3-the-git-smart-http-authorization-layer-in)
- [Gogs open redirect via backslash normalization mismatch](https://junglewise.ai/threats/cve-2026-82402-gogs-is-an-open-source-self-hosted-git-service-prior-to-0-15-0)
- [GO-2026-5193 - Gogs: XSS in .ipynb files renderer due to outdated notebookjs in gogs.io/gogs](https://junglewise.ai/threats/go-2026-5193-gogs-xss-in-ipynb-files-renderer-due-to-outdated-d1e8727f)
- [Gogs stored XSS in Jupyter Notebook sanitizer endpoint](https://junglewise.ai/threats/cve-2026-52816-gogs-stored-xss-in-jupyter-notebook-sanitizer-endpoint)
- [Gogs unauthenticated information disclosure in organization teams API](https://junglewise.ai/threats/cve-2026-52815-gogs-unauthenticated-information-disclosure-in-organization-teams)