OAuth2 Scope Bypass in Gitea via HTTP Basic Auth

Publication date: 2026-07-03

Last updated on: 2026-07-03

Assigner: Gitea Limited

Description

Gitea versions up to and including 1.26.1 allow OAuth2 access token scope enforcement to be bypassed through HTTP Basic authentication.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-03

Last Modified

2026-07-03

Generated

2026-07-04

AI Q&A

2026-07-04

EPSS Evaluated

N/A

NVD

CVE-2026-28699

Affected Vendors & Products

Vendor	Product	Version / Range
gitea	gitea	to 1.26.1 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Gitea versions up to and including 1.26.1. It allows an attacker to bypass OAuth2 access token scope enforcement by using HTTP Basic authentication.

Impact Analysis

Because the OAuth2 access token scope enforcement can be bypassed, an attacker with HTTP Basic authentication credentials could gain unauthorized access to resources or perform actions beyond their intended permissions. This can lead to a high impact on confidentiality and integrity of data.

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