CVE-2026-27771: Code.gitea.io/gitea Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-8qw8-rq86-9pc2
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CVSS 8.2
CWE-862
Published
Advisory Summary

CVE-2026-27771 is a HIGH (CVSS 8.2) remote code execution vulnerability (CWE-862: Missing Authorization) affecting Code.gitea.io/gitea libraries in the Go ecosystem. The issue involves gitea has insufficient permission checks for composer package source links. Remediation is available by upgrading affected packages to version 1.26.2.

CVE-2026-27771 at a Glance

CVE Identifier CVE-2026-27771
GHSA Identifier GHSA-8qw8-rq86-9pc2
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-862: Missing Authorization
Affected Product Code.gitea.io/gitea
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.2

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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 Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-27771

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: 1.26.2 
Upgrade code.gitea.io/gitea to 1.26.2
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-2026-27771, 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 1.26.2), 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-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. 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

### CVE Description Gitea versions up to and including 1.26.1 have insufficient permission checks for Composer package source links, which can expose private or internal package source information. ### Summary A critical vulnerability has been discovered in Gitea. It was already reported via (security@gitea.io) from (dev@noscope.com), and submitted an encrypted report.

CVE-2026-27771 Affected Code.gitea.io/gitea Versions

1 component(s)
Fixed Versions:
1.26.2
Product / Package Ecosystem Affected Versions Fixed Version
code.gitea.io/gitea
golang/code.gitea.io/gitea
Go
< 1.26.2
1.26.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/go-gitea/gitea/security/advisories/GHSA-8qw8-rq86-9pc2
NVD — CVE-2026-27771 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27771
Code.gitea.io/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/37610
blog.gitea.com/release-of-1.26.2 WEB
https://blog.gitea.com/release-of-1.26.2
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/v1.26.2

Frequently Asked Questions

What is CVE-2026-27771?
CVE-2026-27771 is a security vulnerability in Code.gitea.io/gitea involving Gitea has insufficient permission checks for Composer package source links under CWE-862: Missing Authorization.
Which Code.gitea.io/gitea versions are affected?
Affected versions include releases prior to 1.26.2 across affected packages: code.gitea.io/gitea.
What version fixes CVE-2026-27771?
Upgrading to 1.26.2 (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 1.26.2. Upgrade your dependency to 1.26.2 or later.
What is the CVSS score of CVE-2026-27771?
CVE-2026-27771 has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2026-27771?
CVE-2026-27771 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Go dependencies for CVE-2026-27771?
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-8qw8-rq86-9pc2",
  "modified" : "2026-07-17T19:04:37Z",
  "published" : "2026-07-17T19:04:37Z",
  "aliases" : [ "CVE-2026-27771" ],
  "summary" : "Gitea has insufficient permission checks for Composer package source links",
  "details" : "### CVE Description\nGitea versions up to and including 1.26.1 have insufficient permission checks for Composer package source links, which can expose private or internal package source information.\n\n### Summary\nA critical vulnerability has been discovered in Gitea. It was already reported via (security@gitea.io) from (dev@noscope.com), and submitted an encrypted report.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "code.gitea.io/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.26.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.26.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/security/advisories/GHSA-8qw8-rq86-9pc2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27771"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/37610"
  }, {
    "type" : "WEB",
    "url" : "https://blog.gitea.com/release-of-1.26.2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-gitea/gitea"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/releases/tag/v1.26.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-17T19:04:37Z",
    "nvd_published_at" : "2026-07-03T21:16:59Z"
  }
}