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

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

CVE-2026-53501Published 5 days agoUpdated 1 day agoSource: OSV

Affected packages

  • thumbor— before 7.8.0

Exploit signal

Known exploited (CISA KEV)
No
EPSS score
0.21%
EPSS percentile
11.1%

EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 11%.

Sources

Structured record: https://osv.dev/vulnerability/GHSA-mw3h-qjxj-6xg9

Recommended response stack

Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→

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