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Gitea has insufficient permission checks for Composer package source links

High severity GitHub Reviewed Published Jun 5, 2026 in go-gitea/gitea • Updated Jul 17, 2026

Package

gomod code.gitea.io/gitea (Go)

Affected versions

<= 1.26.1

Patched versions

1.26.2

Description

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.

References

@lunny lunny published to go-gitea/gitea Jun 5, 2026
Published by the National Vulnerability Database Jul 3, 2026
Published to the GitHub Advisory Database Jul 17, 2026
Reviewed Jul 17, 2026
Last updated Jul 17, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(98th percentile)

Weaknesses

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

CVE ID

CVE-2026-27771

GHSA ID

GHSA-8qw8-rq86-9pc2

Source code

Credits

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