CVE-2026-73364
PHP Object Injection in Flexible Subscriptions <=1.8.1 enabling RCE/site takeover
Is CVE-2026-73364 being exploited?
Not confirmed. CVE-2026-73364 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-73364?
CVE-2026-73364 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-73364?
Not known from our data. No patch reference has been recorded for CVE-2026-73364, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-73364 affect?
CVE-2026-73364 affects Flexible Subscriptions <= 1.8.1, WordPress sites running Flexible Subscriptions plugin. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73364?
Disable/remove plugin or isolate affected sites; deploy WAF rule; apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution and full site takeover via PHP object injection (unsafe deserialization), enabling data theft, persistence, and privilege escalation.
Immediate action required
- affected<= 1.8.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.