ellite Wallos up to 4.9.3 OIDC Callback login.php oidc_state improper authorization

Summaryinfo

A vulnerability was found in ellite Wallos up to 4.9.3. It has been classified as critical. The impacted element is an unknown function of the file login.php of the component OIDC Callback Handler. Performing a manipulation of the argument oidc_state results in improper authorization. This vulnerability is reported as CVE-2026-54599. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in ellite Wallos up to 4.9.3. It has been classified as critical. This affects an unknown code block of the file login.php of the component OIDC Callback Handler. The manipulation of the argument oidc_state with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.4, login.php generates an OIDC state nonce stored in $_SESSION['oidc_state'], but checksession.php dispatches the OIDC callback without comparing the incoming state against the session value. An attacker can trick a victim into visiting a crafted URL, causing Wallos to exchange the attacker's authorization code and log the victim into the attacker's account. This issue has been patched in version 4.9.4.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-54599 since 06/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

By approaching the search of inurl:login.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.9.4 eliminates this vulnerability.

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Productinfo

Vendor

• ellite

Name

• Wallos

Version

• 4.9.0
• 4.9.1
• 4.9.2
• 4.9.3

Website

• Product: https://github.com/ellite/Wallos/

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