CVE-2026-53500: Thumbor

High severity, CVSS 8.2. EPSS: 0.5% chance of exploitation in the next 30 days.

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.

Affected products

• Thumbor Thumbor: before 7.8.0 (fixed in 7.8.0)

Published 2026-07-31. Last modified 2026-09-08.