CVE-2026-26232: Code.gitea.io/gitea Gitea OAuth2 Authorization Codes Can Vulnerability

CRITICAL
Advisory Identifier: GHSA-5v69-g2m3-3hq3
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CVSS 9.1
CWE-294
Published
Advisory Summary

CVE-2026-26232 is a CRITICAL (CVSS 9.1) gitea oauth2 authorization codes can vulnerability (CWE-294: Authentication Bypass by Capture-replay) affecting Code.gitea.io/gitea libraries in the Go ecosystem. The issue involves gitea oauth2 authorization codes can be reused after expiry. Remediation is available by upgrading affected packages to version 1.25.5.

CVE-2026-26232 at a Glance

CVE Identifier CVE-2026-26232
GHSA Identifier GHSA-5v69-g2m3-3hq3
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-294: Authentication Bypass by Capture-replay
Affected Product Code.gitea.io/gitea
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 9.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-26232

To remediate this vulnerability, upgrade all affected Code.gitea.io/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.

code.gitea.io/gitea fixed: 1.25.5 
Upgrade code.gitea.io/gitea to 1.25.5
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 code.gitea.io/gitea

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-26232, inspect your project dependencies for Code.gitea.io/gitea:

inspect dependencies for code.gitea.io/gitea

Analyze the terminal output to locate any version of Code.gitea.io/gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.25.5), 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-294: Authentication Bypass by Capture-replay, where a capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). In Code.gitea.io/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

Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange.

CVE-2026-26232 Affected Code.gitea.io/gitea Versions

1 component(s)
Fixed Versions:
1.25.5
Product / Package Ecosystem Affected Versions Fixed Version
code.gitea.io/gitea
golang/code.gitea.io/gitea
Go
< 1.25.5
1.25.5

References

NVD — CVE-2026-26232 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26232
Code.gitea.io/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/36797
Code.gitea.io/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/36851
Security Fix Commit FIX COMMIT
https://github.com/go-gitea/gitea/commit/413074b1e1dc5718b4865b9493d8cc97e1e128de
Security Fix Commit FIX COMMIT
https://github.com/go-gitea/gitea/commit/f3bdcc58aff60b66eba7bd5e9b23457441733dfe
blog.gitea.com/release-of-1.25.5 WEB
https://blog.gitea.com/release-of-1.25.5
Code.gitea.io/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea
Code.gitea.io/gitea Release RELEASE
https://github.com/go-gitea/gitea/releases/tag/v1.25.5

Frequently Asked Questions

What is CVE-2026-26232?
CVE-2026-26232 is a security vulnerability in Code.gitea.io/gitea involving Gitea OAuth2 authorization codes can be reused after expiry under CWE-294: Authentication Bypass by Capture-replay.
Which Code.gitea.io/gitea versions are affected?
Affected versions include releases prior to 1.25.5 across affected packages: code.gitea.io/gitea.
What version fixes CVE-2026-26232?
Upgrading to 1.25.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is code.gitea.io/gitea affected?
Yes, code.gitea.io/gitea is affected in releases prior to 1.25.5. Upgrade your dependency to 1.25.5 or later.
What is the CVSS score of CVE-2026-26232?
CVE-2026-26232 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-26232?
CVE-2026-26232 is classified under CWE-294: Authentication Bypass by Capture-replay (A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).).
How can I check Go dependencies for CVE-2026-26232?
Run the dependency tree command: 'inspect dependencies for code.gitea.io/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-5v69-g2m3-3hq3",
  "modified" : "2026-09-01T17:23:13Z",
  "published" : "2026-07-03T21:31:37Z",
  "aliases" : [ "CVE-2026-26232" ],
  "summary" : "Gitea OAuth2 authorization codes can be reused after expiry",
  "details" : "Gitea versions before 1.25.5 do not consistently enforce OAuth2 authorization code expiry and single-use behavior during token exchange.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "code.gitea.io/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.25.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-26232"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/36797"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/36851"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/commit/413074b1e1dc5718b4865b9493d8cc97e1e128de"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/commit/f3bdcc58aff60b66eba7bd5e9b23457441733dfe"
  }, {
    "type" : "WEB",
    "url" : "https://blog.gitea.com/release-of-1.25.5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-gitea/gitea"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/releases/tag/v1.25.5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-294" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-01T17:23:13Z",
    "nvd_published_at" : "2026-07-03T21:16:58Z"
  }
}