CVE-2026-66563 Critical · 9.8 EPSS 0.3%
Unauthenticated PHP Object Injection in Windsor <= 2.10 versions.
ThemeREX · Windsor
Summary
The Windsor theme from ThemeREX, in versions 2.10 and earlier, contains an unauthenticated PHP object injection flaw involving deserialization of untrusted data. An unauthenticated remote attacker can exploit it over the network with no privileges and no user interaction, with the attack requiring only that the vulnerable Windsor version be in use.
Heading is the official description · NVD
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
13.9 / 100
- Exploited
- Not confirmed
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Disclosed on 10 Oct 2026. No public exploit code or confirmed exploitation is recorded.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Not named in any threat report yetAlso mentioned in 10 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Known_Cve | Oct 21, 2026 | Part 1/420 Oct 2026
- Known_Cve | Oct 20, 2026 | Part 1/419 Oct 2026
- Known_Cve | Oct 19, 2026 | Part 1/418 Oct 2026
- Known_Cve | Oct 18, 2026 | Part 1/417 Oct 2026
- Known_Cve | Oct 17, 2026 | Part 1/416 Oct 2026
- Known_Cve | Oct 16, 2026 | Part 1/315 Oct 2026
- 4 more on OTX