Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M

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

High 7.7

In plain English

A high-severity authentication bypass by spoofing in gogs from gogs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.9%top 41.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	gogs.io/gogs	0.14.3	GHSA-w6j9-vw59-27wv
Go	gogs.io/gogs	no fix listed	GO-2026-5695

Affected products (as reported)

Vendor	Product	Versions
gogs	gogs	< 0.14.3

Weakness: CWE-290 · 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

References

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