CVE-2026-71184 in Gitea
Summary
by MITRE • 10/14/2026
Gitea's pull request review notifier does not attach the pull request to the Actions notification, so the fork workflow approval gate does not recognize the run as originating from a fork. Review comment and review approval or rejection events can consequently load workflow code from the fork head and run it on the base repository's runners without the required maintainer approval. This allows execution of fork-controlled workflow code across the intended approval boundary.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a critical security flaw in Gitea’s integration with its continuous integration system, specifically concerning how pull request review notifications are processed and associated with GitHub Actions workflows. In secure software development practices, particularly when dealing with fork-based contributions, it is essential to enforce strict boundaries between untrusted code from external contributors and the trusted execution environment of the base repository. The core technical flaw lies in the failure of the pull request review notifier to correctly attach or link the specific pull request context to the Actions notification payload. This missing linkage creates a gap in the metadata that determines the origin and trust level of the workflow run, leading to a breakdown in security controls designed to prevent unauthorized code execution.
From an operational perspective, this flaw allows for the bypassing of fork approval gates. Typically, when a pull request is submitted from a fork, CI/CD systems are configured to require explicit maintainer approval before running any workflows that could potentially modify repository state or access sensitive secrets. This gate exists specifically because code in a forked repository is considered untrusted until reviewed and approved by the maintainers of the base project. However, due to the missing attachment of the pull request identifier in the notification event, the system fails to recognize that the workflow run originates from a fork. Consequently, the approval gate logic does not trigger or enforce its restrictions, allowing the CI/CD pipeline to proceed without the necessary human verification step.
The impact of this vulnerability is severe, as it enables arbitrary code execution within the context of the base repository’s runners using code controlled by an external contributor. An attacker can submit a pull request containing malicious workflow definitions in their forked copy of the repository. Because the system does not correctly identify the run as coming from a fork due to the notification defect, these workflows are executed directly on the runner infrastructure associated with the main project. This execution occurs without maintainer oversight, potentially leading to data exfiltration, compromise of build artifacts, or further lateral movement within the organization’s internal network if the runners have access to such resources. The attacker effectively gains write access and full control over the CI/CD environment under the guise of a legitimate automated test run.
This issue aligns with CWE-20 Improper Input Validation, as the system fails to properly validate or associate the source context (the pull request) with the action being performed. Furthermore, it relates to ATT&CK technique T1654 Logical Injection, where an attacker manipulates input data to influence software logic flow, in this case bypassing security controls by exploiting a missing contextual link. The vulnerability also touches upon CWE-928 Improper Privilege Assignment, as the workflow runs with elevated privileges intended for trusted code rather than restricted permissions suitable for untrusted fork contributions.
To mitigate this risk, immediate action must be taken to ensure that all CI/CD notifications originating from pull requests include complete and accurate metadata regarding their source repository type (fork vs. direct push). Developers should verify that the webhook payloads or internal event structures correctly propagate the pull request ID and associated branch information to the Actions engine. Additionally, implementing a defense-in-depth strategy is recommended by enforcing stricter validation checks within the workflow dispatch logic itself, ensuring that any run identified as originating from an external fork explicitly requires manual approval before execution begins, regardless of how the notification was triggered. Regular auditing of CI/CD pipeline configurations and webhook integrations can help detect similar logical flaws where context information might be lost or misinterpreted during event processing.