by Kastro
Paper/Archive/CVE-2026-18391

CVE-2026-18391

Unknown WooCommerce Subscriptions — WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection

EPSS 1.0%public exploitCVSS 9.8
critical.is priorityof 100
52
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 61.7.617 × 2012.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on stores with High-Performance Order Storage enabled, leading to a PHP Object Injection issue which unauthenticated users can escalate to Remote Code Execution via a gadget chain present in the bundled dependencies.

Affected

ProductAffectedFixed inSource
WooCommerce Subscriptions4.7.0 – < 9.1.09.1.0CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitwpscan.com/vulnerability/191f76cf-e5bd-4a37-ac1c-9187cea2aa27