CVE-2026-59713: CSRF (CVSS 8.1)

Description

Leantime contains an OIDC login CSRF vulnerability in the verifyState() method that unconditionally returns true without validating state parameters. Attackers can craft malicious callback URLs with attacker-controlled authorization codes to perform session fixation, logging victims in as the attacker.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0015

Probability of exploitation

0.05%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-352 Cross-Site Request Forgery

References

Other References

https://github.com/Leantime/leantime https://github.com/Leantime/leantime/commit/9630eb7db682fb1b4e23cdabf3428d03ec6f5094 https://github.com/Leantime/leantime/issues/3535 https://www.vulncheck.com/advisories/leantime-oidc-login-csrf-via-unconditional-state-verification-stub

Frequently Asked Questions

What is CVE-2026-59713? +

Leantime contains an OIDC login CSRF vulnerability in the verifyState() method that unconditionally returns true without validating state parameters. Attackers can craft malicious callback URLs with attacker-controlled authorization codes to perform session fixation, logging victims in as the attacker. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-59713? +

CVE-2026-59713 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0015, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-59713? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-59713