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9.1
CRITICAL CVSS 3.1
CVE-2026-20912
Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure
Description

Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.

INFO

Published Date :

Jan. 22, 2026, 10:16 p.m.

Last Modified :

Jan. 29, 2026, 10:03 p.m.

Remotely Exploit :

Yes !

Source :

88ee5874-cf24-4952-aea0-31affedb7ff2
Affected Products

The following products are affected by CVE-2026-20912 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Gitea gitea
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Validate repository ownership when linking release attachments to prevent unauthorized access.
  • Ensure proper validation of repository ownership for attachments.
  • Review and enforce access controls for release assets.
  • Update the application to enforce strict ownership checks.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20912.

URL Resource
https://blog.gitea.com/release-of-1.25.4/ Release Notes
https://github.com/go-gitea/gitea/pull/36320 Issue Tracking Patch
https://github.com/go-gitea/gitea/pull/36355 Issue Tracking Patch
https://github.com/go-gitea/gitea/releases/tag/v1.25.4 Release Notes
https://github.com/go-gitea/gitea/security/advisories/GHSA-vfmv-f93v-37mw Broken Link
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20912 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20912 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20912 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20912 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jan. 29, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:gitea:gitea:*:*:*:*:*:-:*:* versions up to (excluding) 1.25.4
    Added Reference Type Gitea Limited: https://blog.gitea.com/release-of-1.25.4/ Types: Release Notes
    Added Reference Type Gitea Limited: https://github.com/go-gitea/gitea/pull/36320 Types: Issue Tracking, Patch
    Added Reference Type Gitea Limited: https://github.com/go-gitea/gitea/pull/36355 Types: Issue Tracking, Patch
    Added Reference Type Gitea Limited: https://github.com/go-gitea/gitea/releases/tag/v1.25.4 Types: Release Notes
    Added Reference Type Gitea Limited: https://github.com/go-gitea/gitea/security/advisories/GHSA-vfmv-f93v-37mw Types: Broken Link
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jan. 23, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  • New CVE Received by 88ee5874-cf24-4952-aea0-31affedb7ff2

    Jan. 22, 2026

    Action Type Old Value New Value
    Added Description Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.
    Added CWE CWE-284
    Added CWE CWE-639
    Added Reference https://blog.gitea.com/release-of-1.25.4/
    Added Reference https://github.com/go-gitea/gitea/pull/36320
    Added Reference https://github.com/go-gitea/gitea/pull/36355
    Added Reference https://github.com/go-gitea/gitea/releases/tag/v1.25.4
    Added Reference https://github.com/go-gitea/gitea/security/advisories/GHSA-vfmv-f93v-37mw
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact