Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version
Priority HIGH 73Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web scripts that execute in the context of a logged-in administrator.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00505 43rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Simple Membership (Unknown): 4.7.5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Simple Membership | before 4.7.5 | 4.7.5 | Patch available | CNA |
- Simple Membership VendorUnknown Affected before 4.7.5 Fixed in 4.7.5 Patch available CNA
Remediation
- Fix · CNA Simple Membership (Unknown) Fixed in 4.7.5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-11855
- 2026-10-03 Alias added: GHSA-xmqj-cv3v-f292
References
Sources
- CVE-2026-11855 · CVE Program
- CVE-2026-11855 · NVD
- FIRST EPSS
- GHSA-xmqj-cv3v-f292 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences