CVE-2026-30920: High Vulnerability in HackerBay OneUptime

The vulnerability identified as CVE-2026-30920 affects HackerBay's OneUptime application prior to version 10.0.19. This vulnerability allows attackers to exploit a flaw in the GitHub App callback mechanism, which does not validate the authorization of the caller for the target project. Specifically, the application trusts attacker-controlled state and installation_id values, which can lead to unauthorized overwriting of another project's GitHub App installation binding.

With a CVSS score of 8.6, this vulnerability is classified as high severity. The potential impact includes unauthorized access to sensitive project data, as attackers can enumerate repositories and create CodeRepository records in arbitrary projects. Organizations should assess the risk posed by this vulnerability, especially those utilizing versions prior to 10.0.19.

The OneUptime vulnerability was published on March 10, 2026, and has been analyzed thoroughly. Given the nature of the vulnerability, it is critical for affected organizations to prioritize patching their systems to prevent potential exploitation.

Organizations should implement remediation strategies to mitigate the risks associated with this vulnerability and ensure proper authorization checks are enforced within their applications.

Vulnerability Details

This vulnerability allows attackers to overwrite GitHub App installation bindings due to a lack of effective authorization checks. The vulnerability is classified under several CWE categories, including CWE-345 (Insufficient Verification of Data Authenticity), CWE-639 (Authorization Bypass Through User-Controlled Key), and CWE-862 (Missing Authorization).

The vulnerability's CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L, which indicates a network attack vector, low attack complexity, and no privileges required for exploitation. The potential confidentiality impact is low, while integrity impact is high, and availability impact is low.

Technical Analysis

The root cause of this vulnerability stems from improper validation of the caller's authorization in the GitHub App installation flow. Attackers can exploit this flaw by providing manipulated state and installation_id values, allowing them to affect other projects without proper authorization.

The attack vector is primarily network-based, meaning that exploitation can occur remotely without the need for physical access. The attack complexity is low, and no user interaction is required to exploit this vulnerability. As a result, the potential for exploitation by malicious actors is significant.

The vulnerability impacts the integrity of the affected projects, as attackers may alter project configurations without authorization. Organizations using affected versions of OneUptime should be particularly vigilant in monitoring their systems for signs of exploitation.

Risk & Impact Analysis

Risk to organizations includes unauthorized access to project data and the ability to manipulate project settings. The blast radius of this vulnerability could extend to any project utilizing OneUptime prior to version 10.0.19, allowing attackers to compromise multiple projects if proper security measures are not in place.

Given the high CVSS score and the potential for significant impact, organizations should prioritize patching immediately. The lack of effective authorization checks in related GitHub endpoints further exacerbates the risk, allowing attackers to enumerate repositories and create unauthorized records.

Organizations are urged to address this vulnerability in their priority patch cycle and ensure that all security measures are in place to prevent exploitation.

Exploitation Status

Affected Versions

All versions of OneUptime prior to 10.0.19 are affected by this vulnerability. Organizations should ensure that they upgrade to this version or later to mitigate the risk.

Mitigation & Remediation

To remediate this vulnerability, organizations must patch their OneUptime installations to version 10.0.19 or later. It is essential to confirm that all security measures are effectively enforced, including proper authorization checks for GitHub App installations.

If immediate patching is not feasible, organizations should consider implementing workarounds, such as restricting access to the GitHub App installation process and monitoring for unusual activity within their projects.

For further guidance on maintaining application security, organizations may refer to available resources on application security assessments and best practices.

Detection Guidance

To detect potential exploitation of this vulnerability, organizations should monitor logs for unauthorized access attempts, particularly in the GitHub App installation process.

Additionally, behavioral anomalies such as unexpected changes to project configurations or unauthorized creation of CodeRepository records should be investigated promptly.

Network signatures corresponding to GitHub API calls may also provide indicators of compromise and should be implemented for ongoing security monitoring.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2026-30920 lies in its demonstration of the importance of enforcing strict authorization checks within application workflows. As organizations increasingly rely on integrations with external platforms like GitHub, ensuring secure interactions becomes paramount.

This vulnerability serves as a reminder for security teams to evaluate their application's security posture and implement robust authorization measures. Organizations can learn valuable lessons from this incident to strengthen their security frameworks.

For organizations looking to enhance their security practices, resources such as vulnerability management programs and penetration testing methodologies can provide valuable insights.

Lastly, organizations should consider engaging in penetration testing to proactively identify and remediate similar vulnerabilities in their applications.