WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18391
StatePUBLISHED
AssignerWPScan
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 06:20:14 UTC
Updated2026-08-26 16:30:52 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006080000 probability, percentile 0.464980000 (date 2026-08-26)

Problem Types: CWE-434 | CWE-94 Improper Control of Generation of Code ('Code Injection') | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Unknown WooCommerce Subscriptions affected 4.7.0 9.1.0 semver Not specified

References

ReferenceSourceLinkTags
wpscan.com/vulnerability/191f76cf-e5bd-4a37-ac1c-9187cea2aa27 [email protected] wpscan.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Vasily Belolapotkov (en)

CNA: Vlad Olaru (en)

CNA: WPScan (en)

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