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CVE-2026-53501

8.2 · HIGH

Thumbor is an open-source photo thumbnail service by globo.com.

Published Jul 31, 2026CWE-347EPSS 0.35%

Overview

CVE-2026-53501 is a high-severity vulnerability. It was published on July 31, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/thumbor/thumbor/commit/e3ae3e2500537b4d735df4144129a649374bb70bGitHubgithub.com/thumbor/thumbor/releases/tag/7.8.0GitHubgithub.com/thumbor/thumbor/security/advisories/GHSA-mw3h-qjxj-6xg9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53501?

CVE-2026-53501 is a high-severity vulnerability. It was published on July 31, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-53501?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53501?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53501?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53501 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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