WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection
CVSS score
9.8
EPSS probability
%1.0
Risk score
0.1
Published
2 mo ago
Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.
Impact on My Inventory
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%61
Short explanation
WooCommerce Subscriptions before 9.1.0 suffers from unauthenticated PHP Object Injection leading to Remote Code Execution when High-Performance Order Storage is enabled. No public exploit or active exploitation is confirmed. Patch status is UNKNOWN. Upgrade to 9.1.0 or later is recommended.
This vulnerability allows unauthenticated attackers to execute arbitrary code on affected systems, posing a significant risk to WordPress sites using WooCommerce Subscriptions. No public exploit or active exploitation is confirmed, but the risk remains due to the unauthenticated nature and potential for remote code execution.
What should be done?
- Upgrade to WooCommerce Subscriptions 9.1.0 or later to resolve the vulnerability.
- Ensure High-Performance Order Storage is disabled if not required.
- Follow vendor advisories for official patch details without assuming a fixed version.
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
WooCommerce Subscriptions plugin'ı 9.1.0'ın altında sürümü, Yüksek Performanslı Sipariş Depolama özelliğinin etkin olduğu durumlarda, kullanıcı girdisi doğrulama eksikliği nedeniyle PHP Nesne İncelmesi ile dışarıdan kod çalıştırma (RCE) riski taşır.
Kullanıcı tarafından açık bir istismar veya aktif istismar bulunmamaktadır. CISA'nın KEV listesinde bu ele geçirme yer almamaktadır ve yama durumu, mevcut kanıtla belirsizdir.
Etkilenen sürüm aralığı 4.7.0 < 9.1.0'dır. Yama sürümü resmî olarak belirtilmemiştir ve yama değerlendirmesi belirsizdir.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-434
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-18391 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Unknown | WooCommerce Subscriptions | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.8 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CVE ADP |
| 9.8 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-18391 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-18391 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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Get this vulnerability through the API
Affected products, version ranges, exploitation status and patch information in a single request, with a free key.
curl -H "x-api-key: $DAYBREACH_API_KEY" \ "https://api.enginteksut.com.tr/api/v1/intel/cves/CVE-2026-18391"