Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref
Priority LOW 24CWE-269Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-269.
Summary
The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0023 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Simple Membership (Unknown): 4.7.8
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
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 4.7.8 | 4.7.8 | Patch available | CNA |
- Simple Membership VendorUnknown Affected before 4.7.8 Fixed in 4.7.8 Patch available CNA
Remediation
- Fix · CNA Simple Membership (Unknown) Fixed in 4.7.8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-88764
- 2026-10-03 Alias added: GHSA-cmhf-4mfx-3gf7
References
Sources
- CVE-2026-88764 · CVE Program
- CVE-2026-88764 · NVD
- FIRST EPSS
- GHSA-cmhf-4mfx-3gf7 · 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