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Mallory
HighPublic exploit

Kimai 1.30.10 SameSite session cookie misconfiguration (session hijacking)

IdentifiersCVE-2023-53957CWE-1275· Sensitive Cookie with Improper…

Kimai 1.30.10 contains a session cookie SameSite attribute weakness (Sensitive Cookie with Improper SameSite Attribute) that can allow an attacker to obtain a victim’s session cookie under malicious conditions. The provided content describes an attack scenario where a victim is tricked into executing attacker-supplied content (a crafted PHP script) that captures session cookie information and writes it to a file, enabling subsequent session hijacking.

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ANALYST BRIEF

Impact, mitigation & remediation

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Impact

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If successfully exploited, an attacker can steal user session cookies and hijack authenticated sessions, potentially resulting in account takeover and unauthorized actions performed as the victim. The content indicates high impact to confidentiality and integrity.

Mitigation

If you can’t patch tonight, do this now.

No specific vendor workaround is provided in the content. Compensating controls described include restricting/disable execution of untrusted PHP scripts in the Kimai hosting environment, enforcing least-privilege file permissions to prevent writing captured cookies to disk, and applying additional web hardening (e.g., WAF rules) to reduce the likelihood of successful social engineering or attacker-supplied script execution.

Remediation

Patch, then assume compromise.

Upgrade Kimai to a version newer than 1.30.10 that corrects the session cookie SameSite configuration (apply vendor security patches once available/confirmed). After upgrading, validate that session cookies are set with appropriate attributes (at minimum SameSite, and typically Secure and HttpOnly as well).
PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

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VendorProductType
KimaiKimaiapplication

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Threat actor evidence

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Associated malware

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Detection signatures

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Social activity4

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