CVE-2026-59774: Critical Gitea Flaw Allows Unauthenticated File Access has been identified in the self-hosted Git platform Gitea, affecting versions 1.22.1 through 1.27.0. This vulnerability enables unauthenticated attackers to read any file accessible to the service account without requiring login or repository write access. The flaw, rated Critical with a CVSS score of 9.8, was formally disclosed on August 2, 2026, and has been patched in Gitea version 1.27.1. Administrators are urged to upgrade immediately to mitigate potential risks.
CVE-2026-59774 Details and Impact
The vulnerability allows attackers to exploit Gitea’s markup rendering endpoint, specifically through the POST /{owner}/{repo}/markup route. This endpoint does not require user authentication for public repositories, making it susceptible to unauthorized access. An attacker can craft Org-mode markup to read files that the service account can access, including sensitive configuration files.
Gitea has indicated that while the flaw does not directly lead to remote code execution, it could potentially escalate to command execution if an attacker successfully reads the app.ini file and extracts the INTERNAL_TOKEN. This could allow further exploitation through injected Git hooks.
Recommended Actions for Administrators
Gitea has advised that cloud instances will be automatically upgraded, but self-hosted administrators must take immediate action to upgrade to version 1.27.1. Additionally, if there is any indication that the markup endpoint was accessed on an affected version, administrators should treat all credentials readable by the Gitea service account as compromised. This includes rotating internal tokens, OAuth materials, JWT signing materials, and database credentials.
It is crucial for administrators to review logs for any unauthorized POST requests to the markup endpoint, particularly those involving Org-mode rendering or absolute filesystem paths. This will help identify any potential exploitation attempts.
Exploitation Status and Historical Context
As of August 5, 2026, there have been no reports of exploitation of CVE-2026-59774 in the wild, and it has not been listed in CISA’s Known Exploited Vulnerabilities catalog. The vulnerability was publicly previewed prior to its formal advisory, indicating a proactive approach to vulnerability disclosure.
This incident follows a series of security updates from Gitea, including a critical reverse-proxy authentication bypass and a container-registry access-control flaw earlier in 2026. These vulnerabilities highlight ongoing security challenges within the platform and the importance of timely updates.
Conclusion and Next Steps
Gitea’s advisory emphasizes the need for immediate upgrades to version 1.27.1 to address CVE-2026-59774. Administrators should remain vigilant and conduct thorough checks of their systems to ensure no unauthorized access has occurred. Continuous monitoring and prompt updates will be essential in maintaining the security of Gitea deployments.
This report is based on information published by thehackernews.com.
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