What is CVE-2026-53500?

CVE-2026-53500 is a high-severity vulnerability in Thumbor, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-07-31.

How severe is CVE-2026-53500?

High severity. CVSS v3 base score is 8.2 out of 10.

SSRF in Thumbor

CVE-2026-53500

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. T…

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L.

Affected products

Thumbor — versions < 7.8.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-53500?: CVE-2026-53500 is a high-severity vulnerability in Thumbor, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.2/10. Published 2026-07-31.
How severe is CVE-2026-53500?: High severity. CVSS v3 base score is 8.2 out of 10.