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Windsor

1 CVEs product

Monthly

CVE-2026-66563 Oct 10, 19:36 CRITICAL Act Now

Unauthenticated PHP object injection in the WordPress theme Windsor (ThemeREX) through version 2.10 lets remote attackers feed crafted serialized data into an unserialize() call reachable without authentication or user interaction, scoring a maximum base 9.8 under CVSS 3.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Reported by Patchstack and tracked as CWE-502, the flaw's realized impact depends on whether a usable PHP gadget chain exists across the theme, WordPress core, and installed plugins - in an unpatched site with a suitable gadget, this can escalate to code execution, arbitrary file or data manipulation, whereas without one the injection may be largely inert. At time of analysis there is no public exploit code identified and no CISA KEV listing, so exploitation is not confirmed in the wild; no vendor-released fix version appears in the available advisory data. Given the unauthenticated, network-reachable profile and the prevalence of gadget-rich plugin stacks, this should be treated as high priority for any site running the theme.

PHP WordPress Deserialization Wordpress Theme Themerex +1
NVD
CVSS 3.1
9.8
EPSS
0.3%
EPSS 0% CVSS 9.8
CRITICAL Act Now

Unauthenticated PHP object injection in the WordPress theme Windsor (ThemeREX) through version 2.10 lets remote attackers feed crafted serialized data into an unserialize() call reachable without authentication or user interaction, scoring a maximum base 9.8 under CVSS 3.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Reported by Patchstack and tracked as CWE-502, the flaw's realized impact depends on whether a usable PHP gadget chain exists across the theme, WordPress core, and installed plugins - in an unpatched site with a suitable gadget, this can escalate to code execution, arbitrary file or data manipulation, whereas without one the injection may be largely inert. At time of analysis there is no public exploit code identified and no CISA KEV listing, so exploitation is not confirmed in the wild; no vendor-released fix version appears in the available advisory data. Given the unauthenticated, network-reachable profile and the prevalence of gadget-rich plugin stacks, this should be treated as high priority for any site running the theme.

PHP WordPress Deserialization +3
NVD

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