CVE-2026-25779: Gitea Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-j5r2-4c8j-xc3m
Share
CWE-601
Published
Advisory Summary

CVE-2026-25779 is a MODERATE open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Gitea libraries in the Go ecosystem. The issue involves open redirect via redirect_to. Remediation is available by upgrading affected packages to version 1.26.0.

CVE-2026-25779 at a Glance

CVE Identifier CVE-2026-25779
GHSA Identifier GHSA-j5r2-4c8j-xc3m
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Gitea
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-25779

To remediate this vulnerability, upgrade all affected Gitea dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/go-gitea/gitea fixed: 1.26.0 
Upgrade github.com/go-gitea/gitea to 1.26.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/go-gitea/gitea

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-25779, inspect your project dependencies for Gitea:

inspect dependencies for github.com/go-gitea/gitea

Analyze the terminal output to locate any version of Gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.26.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Gitea, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Details Despite the validation within `urlIsRelative` in `modules/httplib/url.go`, an open redirect is still possible due to usage of directory traversal sequences plus a back-slash in the "redirect_to" parameter. ### PoC When a user uses this URL to login: `https://gitea.com/user/login?redirect_to=/a/../\example.com` They would be redirected to `example.com` upon a successful login to their gitea account. ### Impact * Phishing: Attackers can use trusted domain links to redirect victims to credential-harvesting pages * OAuth/SSO Token Theft: In authentication flows, authorization codes or tokens may leak via redirect * Referer Leakage: Sensitive URL parameters may be exposed to attacker domains via the Referer header * Cache Poisoning: In deployments with shared caches, malicious redirects may be cached and served to other users

CVE-2026-25779 Affected Gitea Versions

1 component(s)
Fixed Versions:
1.26.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/go-gitea/gitea
golang/github.com/go-gitea/gitea
Go
< 1.26.0
1.26.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/go-gitea/gitea/security/advisories/GHSA-j5r2-4c8j-xc3m
Gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea

Frequently Asked Questions

What is CVE-2026-25779?
CVE-2026-25779 is a security vulnerability in Gitea involving Open Redirect via redirect_to under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Gitea versions are affected?
Affected versions include releases prior to 1.26.0 across affected packages: github.com/go-gitea/gitea.
What version fixes CVE-2026-25779?
Upgrading to 1.26.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/go-gitea/gitea affected?
Yes, github.com/go-gitea/gitea is affected in releases prior to 1.26.0. Upgrade your dependency to 1.26.0 or later.
What CWE is associated with CVE-2026-25779?
CVE-2026-25779 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Go dependencies for CVE-2026-25779?
Run the dependency tree command: 'inspect dependencies for github.com/go-gitea/gitea'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j5r2-4c8j-xc3m",
  "modified" : "2026-06-17T18:10:46Z",
  "published" : "2026-06-17T18:10:46Z",
  "aliases" : [ "CVE-2026-25779" ],
  "summary" : "Gitea: Open Redirect via redirect_to",
  "details" : "### Details\n\nDespite the validation within `urlIsRelative` in `modules/httplib/url.go`, an open redirect is still possible due to usage of directory traversal sequences plus a back-slash in the \"redirect_to\" parameter.\n\n### PoC\n\nWhen a user uses this URL to login:\n\n`https://gitea.com/user/login?redirect_to=/a/../\\example.com`\n\nThey would be redirected to `example.com` upon a successful login to their gitea account.\n\n### Impact\n\n* Phishing: Attackers can use trusted domain links to redirect victims to credential-harvesting pages\n* OAuth/SSO Token Theft: In authentication flows, authorization codes or tokens may leak via redirect\n* Referer Leakage: Sensitive URL parameters may be exposed to attacker domains via the Referer header\n* Cache Poisoning: In deployments with shared caches, malicious redirects may be cached and served to other users",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/go-gitea/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.26.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.25.4"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/security/advisories/GHSA-j5r2-4c8j-xc3m"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-gitea/gitea"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-17T18:10:46Z",
    "nvd_published_at" : null
  }
}