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Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature

🗓️ 31 Jul 2026 18:51:54Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Thumbor HMAC validation can be bypassed by removing all occurrences of the signature with multiple replace calls.

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31 Jul 2026 18:51Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.18.2
SSVC
3