CVE-2025-56643 identifies a security vulnerability in Requarks Wiki.js version 2.5.307 related to improper session management of JSON Web Tokens (JWT). When a user logs out, the system fails to revoke or invalidate the active JWT tokens, allowing these tokens to remain valid and reusable. This flaw is rooted in the authentication resolver logic, which governs token validation for both the GraphQL API endpoint and the logout process. Because JWTs are bearer tokens, possession of a valid token grants access to the system without requiring re-authentication. Consequently, if an attacker obtains a token—through interception, theft, or other means—they can continue to access the Wiki.js system even after the legitimate user has logged out. This undermines session integrity and confidentiality, potentially exposing sensitive documentation or internal knowledge bases. The vulnerability does not require user interaction beyond token theft and does not currently have known exploits in the wild. No CVSS score has been assigned, and no official patches or mitigations have been published as of the date. This issue highlights the importance of proper token lifecycle management, including token revocation or short expiration times, especially for systems relying on JWT for authentication.

For European organizations, the impact of this vulnerability can be significant, particularly for those using Wiki.js to manage sensitive internal documentation, intellectual property, or regulated data such as GDPR-protected personal information. Unauthorized reuse of JWT tokens can lead to unauthorized access to confidential information, data leakage, and potential compliance violations. The persistence of valid tokens after logout increases the risk of session hijacking and lateral movement within an organization's network. This can undermine trust in internal knowledge management systems and may facilitate further attacks if attackers leverage the access gained through compromised tokens. Organizations in sectors such as finance, healthcare, government, and technology, where Wiki.js might be deployed, face elevated risks. The absence of known exploits suggests a window of opportunity for proactive mitigation before widespread exploitation occurs.

To mitigate this vulnerability, organizations should implement the following specific measures: 1) Upgrade Wiki.js to a version where this vulnerability is patched once available; monitor vendor advisories closely. 2) If an immediate patch is unavailable, consider disabling JWT-based authentication or restricting access to trusted networks only. 3) Implement server-side token revocation mechanisms, such as maintaining a token blacklist or using short-lived JWTs combined with refresh tokens that can be revoked. 4) Enhance monitoring and logging of authentication events, particularly token usage and logout actions, to detect suspicious reuse of tokens. 5) Educate users about the importance of secure token handling and encourage use of multi-factor authentication (MFA) where possible to reduce the impact of token compromise. 6) Conduct regular security assessments of Wiki.js deployments and integrate token management best practices into the organization's security policies. 7) Consider network segmentation and access controls to limit exposure of Wiki.js instances.