CVE-2026-58511 in Gitea
Summary
by MITRE • 08/13/2026
Webhook Authorization Header Returned in Plaintext via API
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical security flaw where authorization headers containing sensitive authentication tokens are inadvertently exposed in plaintext within API responses or webhook communications. The issue typically occurs when web applications fail to properly sanitize or filter response data, resulting in the inclusion of authorization headers such as Authorization, X-API-Key, or custom token fields in webhook payloads or API return values. This exposure directly violates fundamental security principles and creates significant risk for systems relying on token-based authentication mechanisms.
The technical implementation flaw stems from inadequate input validation and output sanitization processes within the application's API handling code. When webhook requests are processed or API responses are generated, the system does not properly filter out sensitive header information before including it in the response payload. This can occur through multiple vectors including improper logging configurations where headers are written to logs without sanitization, direct inclusion of request headers in response objects, or insufficient middleware filtering that should strip authentication tokens from outbound communications. The vulnerability is particularly dangerous when combined with other weaknesses such as insufficient transport layer security or weak access controls.
The operational impact of this vulnerability extends far beyond simple information disclosure. Attackers who can intercept webhook communications or analyze API responses gain immediate access to valid authentication tokens, potentially enabling them to impersonate legitimate users or systems within the targeted environment. This exposure allows for privilege escalation attacks where unauthorized parties can access protected resources, modify data, or perform administrative functions. The risk is amplified when these tokens are long-lived or have broad permission scopes, as they may provide persistent access to sensitive systems and data repositories. Organizations operating under compliance frameworks such as pci dss, hipaa, or gdpr face significant regulatory violations when such exposures occur.
Mitigation strategies must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The primary solution involves implementing comprehensive header filtering mechanisms at all levels of the application stack, ensuring that authorization headers are stripped from outbound communications before being included in any response payload or webhook transmission. This approach aligns with security best practices outlined in the owasp top ten and follows principles from the mitre att&ck framework under the credential access and defense evasion domains. Organizations should also implement automated monitoring solutions to detect and alert on unauthorized header exposure patterns, enforce strict transport layer security requirements including tls 1.3 for all communications, and regularly audit their API response handling code. Additionally, implementing token rotation mechanisms and reducing token lifespans can limit the damage potential from any successful exploitation attempts. The vulnerability demonstrates the importance of following secure coding practices as outlined in cwe categories 20, 79, and 284, which specifically address input validation failures, cross-site scripting, and improper access control respectively.
Security teams must also consider implementing network-based monitoring solutions that can detect unauthorized header exposure patterns within their infrastructure. The remediation process should include comprehensive code reviews focusing on response handling logic, automated testing procedures that verify header sanitization, and regular penetration testing to identify potential exposure vectors. Organizations should establish clear policies for handling sensitive data in all communication channels and ensure that development teams follow established security guidelines during the software development lifecycle. Regular training programs emphasizing secure coding practices and the importance of protecting authentication tokens can help prevent similar issues from recurring in future implementations.