CVE WatchJul 31, 2026

CVE-2026-53501

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of

CVSS

8.2

High

EPSS

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KEV

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Exploit Today

0-100

Published: Jul 31, 2026 · Last modified: Jul 31, 2026 · CWE-347

EPSS · 30d

Not enough EPSS history yet.

Technical description

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabling loading images from unintended domains or paths. This issue is fixed in 7.8.0.

Official references

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