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Vulnerability record · CVE-2026-53500 · published 31 July 2026

CVE-2026-53500: Server-side request forgery (SSRF) vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.50% · top 59.7% CWE-918 · Server-side request forgery (SSRF) Deferred
8.2CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

References

LinkTags
https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
https://github.com/thumbor/thumbor/releases/tag/7.8.0
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537

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Source: NIST National Vulnerability Database (record CVE-2026-53500), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.