OPay Payment Gateway for WooCommerce: Unauthenticated Payment Forgery
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
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
The OPay Payment Gateway for WooCommerce WordPress plugin through 2.5.5 does not verify that payment notifications come from the payment provider. The secret used to validate their signature is empty by default. An unauthenticated attacker can forge a valid notification and mark arbitrary orders as paid, cancelled or failed.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
The OPay Payment Gateway for WooCommerce WordPress plugin through 2.5.5 does not properly verify that payment notifications originate from the payment provider, as the secret used to validate their signature is empty by default, allowing unauthenticated attackers to forge a valid notification and mark arbitrary orders as paid, cancelled or failed.
Why it matters now
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 | OPay Payment Gateway for WooCommerce | up to 2.5.5 | — | No fix listed | CNA |
- OPay Payment Gateway for WooCommerce VendorUnknown Affected up to 2.5.5 Fixed in — No fix listed CNA
Remediation
No fixed version is listed for this plugin, and the vendor is listed as Unknown. Until a fix is published, make sure the signature secret is not empty.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-26 Threatist record created from CVE-2026-103319
- 2026-10-26 CVSS score added · CISA ADP
- 2026-10-26 Weakness changed · CISA ADP
- 2026-10-26 CISA SSVC decision points changed
- 2026-10-27 Alias added: GHSA-4xm4-56qr-w7fc
References
Sources
- CVE-2026-103319 · CVE Program
- CVE-2026-103319 · NVD
- FIRST EPSS
- GHSA-4xm4-56qr-w7fc · 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