Is CVE-2026-53500 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-53500?

CVE-2026-53500 has a CVSS v3 severity of HIGH (8.2).

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CVE-2026-53500

Description

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.