CVE-2026-55252 in OpenRun
Summary
by MITRE • 10/01/2026
OpenRun is an open-source, self-hosted GitOps platform for deploying web apps and internal tools to Docker or Kubernetes. Prior to version 0.17.7, the restrictions on redirect URLs in openrun can be bypassed by attackers, leading to open redirect attacks. This issue has been patched in version 0.17.7.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified within OpenRun versions prior to 0.17.7 represents a critical authentication flow weakness classified as an open redirect flaw. As an open-source GitOps platform designed for deploying web applications and internal tools to Docker or Kubernetes environments, OpenRun handles sensitive user credentials and session tokens during the login process. The core technical defect lies in the insufficient validation of callback URLs provided by clients during OAuth2 or similar authentication flows. Specifically, the application fails to strictly enforce a whitelist of allowed redirect URIs against the input parameters supplied by the attacker. This lack of rigorous sanitization allows an adversary to manipulate the redirection endpoint after successful authentication, effectively hijacking the post-login state transition mechanism.
From a technical perspective, this vulnerability aligns with CWE-601, which defines URL Redirection to Untrusted Site (Open Redirect). The flaw typically manifests when the application accepts user-supplied input for the redirect destination without verifying that it matches an expected domain or path structure. In many implementations of such platforms, if the validation logic relies on simple string matching rather than parsing and comparing against a predefined list of authorized origins, attackers can exploit this by appending malicious domains to valid base URLs or using protocol-relative links. This bypass allows the attacker to control where the user's browser is directed immediately after they have authenticated with their legitimate credentials.
The operational impact of this vulnerability extends beyond simple phishing scenarios. While open redirects are often associated with credential harvesting through deceptive login pages, in a GitOps context like OpenRun, the implications can be more severe. An attacker could craft a malicious link that directs an administrator or developer to a spoofed interface mimicking the legitimate OpenRun dashboard. If this spoofed page is designed to capture session cookies or tokens after redirection, it facilitates account takeover attacks. Furthermore, because OpenRun manages deployment pipelines and infrastructure configurations, compromising user accounts can lead to unauthorized modifications of CI/CD workflows, potential injection of malicious code into production environments via compromised Git repositories, and broader compromise of the underlying Kubernetes clusters or Docker hosts managed by the platform.
This behavior is also mapped to MITRE ATT&CK technique T1566.002, which covers Spearphishing Link attacks under Initial Access. By leveraging this open redirect vulnerability, threat actors can create highly convincing phishing links that appear legitimate due to the trusted domain in the URL bar until the final redirection occurs. This significantly increases the success rate of social engineering campaigns targeting users with elevated privileges within the organization's DevOps infrastructure. The ability to bypass these restrictions undermines the integrity of the authentication process and erodes trust in the security posture of the GitOps platform, potentially exposing critical deployment pipelines to manipulation or sabotage.
Mitigation for this vulnerability requires immediate upgrading to version 0.17.7 or later, where the developers have implemented stricter validation logic for redirect URLs. For organizations unable to upgrade immediately due to operational constraints, defensive measures should include implementing a strict allowlist of authorized callback URIs at both the application level and potentially via reverse proxy configurations if applicable. Additionally, enabling Content Security Policy headers with appropriate frame-ancestors and script-src directives can help mitigate some downstream effects by restricting how resources are loaded in redirected contexts. Regular security audits focusing on authentication flows and input validation practices are recommended to prevent similar issues across other components of the GitOps ecosystem.