Paytm Payment Gateway: Forged payment callbacks store administrator-facing XSS
The Paytm Payment Gateway WordPress plugin before 2.8.9 does not sanitize and escape data it stores from payment callbacks before outputting it in an admin page, and the integrity check on those callbacks can be forged when the gateway is enabled without credentials, allowing unauthenticated users to store scripts that will run in the session of a store administrator. The authoritative export does not name the request parameter or handler beyond the affected feature described above. The authoritative export identifies the fixed release as 2.8.9.
- Component
- Paytm Payment Gateway
- Plugin slug
paytm-payment-gateway- Affected
- < 2.8.9
- Safe version
2.8.9- Published
- Oct 01, 2026
- Weakness
- Not assigned
This CVE was published Oct 01, 2026 and is one of 2 known issues for this plugin.
Update, patch or deactivate.
Update Paytm Payment Gateway to 2.8.9 or a later supported release. An application-level fix should validate stored/request input and escape it for the final HTML, attribute, URL or DOM context. Remove persisted malicious content where storage is involved.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Paytm Payment Gateway WordPress plugin before 2.8.9 does not sanitize and escape data it stores from payment callbacks before outputting it in an admin page, and the integrity check on those callbacks can be forged when the gateway is enabled without credentials, allowing unauthenticated users to store scripts that will run in the session of a store administrator.