CVE-2026-53500
HIGHThumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
X_Refsource_Misc x_refsource_misc
https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
X_Refsource_Misc x_refsource_misc
https://github.com/thumbor/thumbor/releases/tag/7.8.0
Scores
CVSS v3
8.2
EPSS
0.0029
EPSS Percentile
21.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-918
Status
published
Products (2)
pypi/thumbor
0 - 7.8.0PyPI
thumbor/thumbor
< 7.8.0
Published
Jul 31, 2026
Tracked Since
Aug 01, 2026