CVE-2025-9803: Improper Authentication in lunary-ai/lunary

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-11-25 · updated 2026-10-18
Weakness: CWE-287

Description

lunary-ai/lunary version 1.9.34 is vulnerable to an account takeover due to improper authentication in the Google OAuth integration. The application fails to verify the 'aud' (audience) field in the access token issued by Google, which is crucial for ensuring the token is intended for the application. This oversight allows attackers to use tokens issued to malicious applications to gain unauthorized access to user accounts. The issue is resolved in version 1.9.35.

Affected products

lunary-ai/lunary: 1.9.34

References

https://github.com/lunary-ai/lunary/commit/95a2cc8e012bf5f089edbfa072ba66dcb7e10d91
https://huntr.com/bounties/4734f35f-514c-4d10-98fa-3a54514f6af6
https://huntr.com/bounties/4734f35f-514c-4d10-98fa-3a54514f6af6

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