Forced attacker-account login via unvalidated OIDC state
Published Aug 31, 2026 · Updated Sep 1, 2026
Cross-site request forgery in Wallos before 4.9.4 allows remote attackers to log victims into attacker-controlled accounts via OIDC. The checksession.php callback reads the incoming state value but dispatches handle_oidc_callback.php without comparing it with the nonce stored by login.php in the session. Exploitation requires administrator-enabled OIDC and victim interaction with a crafted URL; the resulting session is bound to the attacker's account rather than the victim's identity.
Summary
What happened
Cross-site request forgery in Wallos before 4.9.4 allows remote attackers to log victims into attacker-controlled accounts via OIDC. The checksession.php callback reads the incoming state value but dispatches handle_oidc_callback.php without comparing it with the nonce stored by login.php in the session. Exploitation requires administrator-enabled OIDC and victim interaction with a crafted URL; the resulting session is bound to the attacker's account rather than the victim's identity.
The record
- CVE
- CVE-2026-54599
- Published
- Aug 31, 2026
- Updated
- Sep 1, 2026
- Vendor
- ellite
- Product
- Wallos
- Classifications
- CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.9.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream OIDC login-CSRF attack procedureproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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