WP Express Checkout < 2.4.9 - Unauthenticated Payment Bypass via wpec_process_payment
Priority LOW 29CWE-345Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.
Summary
The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00163 5th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed WP Express Checkout (Unknown): 2.4.9
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | WP Express Checkout | before 2.4.9 | 2.4.9 | Patch available | CNA |
- WP Express Checkout VendorUnknown Affected before 2.4.9 Fixed in 2.4.9 Patch available CNA
Remediation
- Fix · CNA WP Express Checkout (Unknown) Fixed in 2.4.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-83533
- 2026-10-03 Alias added: GHSA-rr9j-x6q5-q5pf
References
Sources
- CVE-2026-83533 · CVE Program
- CVE-2026-83533 · NVD
- FIRST EPSS
- GHSA-rr9j-x6q5-q5pf · GitHub Advisory Database · CC BY 4.0
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