What is CVE-2026-81739?

CVE-2026-81739 is a high-severity vulnerability in Paytm Payment Gateway, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-10-01.

How severe is CVE-2026-81739?

High severity. CVSS v3 base score is 7.5 out of 10.

XSS in Paytm Payment Gateway

CVE-2026-81739

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Paytm Payment Gateway

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/f77f3f04-cb98-4687-9080-dd0c99a7e926/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-81739?: CVE-2026-81739 is a high-severity vulnerability in Paytm Payment Gateway, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-10-01.
How severe is CVE-2026-81739?: High severity. CVSS v3 base score is 7.5 out of 10.