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4.3
MEDIUM CVSS 3.1
CVE-2026-20888
Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)
Description

Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users.

INFO

Published Date :

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

Last Modified :

Jan. 29, 2026, 10 p.m.

Remotely Exploit :

Yes !

Source :

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

The following products are affected by CVE-2026-20888 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 MEDIUM 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update Gitea to the latest version to fix the authorization bypass vulnerability in pull request auto-merge cancellation.
  • Update Gitea to the latest version.
  • Apply vendor-provided security patches.
  • Review access controls for pull requests.
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-2026-20888.

URL Resource
https://blog.gitea.com/release-of-1.25.4/ Release Notes
https://github.com/go-gitea/gitea/pull/36341 Issue Tracking Patch
https://github.com/go-gitea/gitea/pull/36356 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-ccq9-c5hv-cf64 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-2026-20888 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-2026-20888 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 CAPEC-665: Exploitation of Thunderbolt Protection Flaws Exploitation of Thunderbolt Protection Flaws

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-2026-20888 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-2026-20888 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/36341 Types: Issue Tracking, Patch
    Added Reference Type Gitea Limited: https://github.com/go-gitea/gitea/pull/36356 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-ccq9-c5hv-cf64 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:L/UI:N/S:U/C:L/I:N/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 verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users.
    Added CWE CWE-284
    Added CWE CWE-862
    Added Reference https://blog.gitea.com/release-of-1.25.4/
    Added Reference https://github.com/go-gitea/gitea/pull/36341
    Added Reference https://github.com/go-gitea/gitea/pull/36356
    Added Reference https://github.com/go-gitea/gitea/releases/tag/v1.25.4
    Added Reference https://github.com/go-gitea/gitea/security/advisories/GHSA-ccq9-c5hv-cf64
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: 4.3
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact