CVE-2026-25119 Gogs: Authentication Bypass via Unvalidated Reverse Proxy Headers
Attackers can bypass authentication and impersonate users by forging headers when reverse proxy authentication is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25119?
CVE-2026-25119 is a high-severity authentication bypass vulnerability in gogs, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2026-25119?
3 open source packages ship an affected version, including gogs.io/gogs.
| Package | Affected | Fixed in |
|---|---|---|
gogs.io/gogs Go | All versions | None |
gogs.io/gogs Go | All versions | 0.14.3 |
gogs.io/gogs Go | All versions | 0.14.3 |
How do I fix CVE-2026-25119?
Upgrade gogs.io/gogs to 0.14.3 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-25119 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25119 exists.
Sources
Also known as GHSA-w6j9-vw59-27wv, GO-2026-5695.