Session fixation via missing OIDC state validation
Published Jul 6, 2026 · Updated Jul 6, 2026
OIDC login CSRF in Leantime 3.4.4 and earlier allows remote attackers to fix a victim's session as the attacker's account. Oidc.php's verifyState() method returns true without comparing the callback state parameter with the value stored for the initiating session. Exploitation requires configured OIDC and a victim to open a crafted callback URL; the resulting browser session operates as the attacker's identity.
Summary
What happened
OIDC login CSRF in Leantime 3.4.4 and earlier allows remote attackers to fix a victim's session as the attacker's account. Oidc.php's verifyState() method returns true without comparing the callback state parameter with the value stored for the initiating session. Exploitation requires configured OIDC and a victim to open a crafted callback URL; the resulting browser session operates as the attacker's identity.
The record
- CVE
- CVE-2026-59713
- Published
- Jul 6, 2026
- Updated
- Jul 6, 2026
- Vendor
- Leantime
- Product
- Leantime
- Classifications
- CWE-352, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 6, 2026CVE publishedPublication date reported by the CVE source.
- Jul 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=3.4.4
What conditions does exploitation require?
What is affected?
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.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo