What is CVE-2026-81740?

CVE-2026-81740 is a medium-severity vulnerability in Paytm Payment Gateway, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-10-02.

How severe is CVE-2026-81740?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Paytm Payment Gateway

CVE-2026-81740

The Paytm Payment Gateway WordPress plugin before 2.8.9 does not verify that payment callbacks genuinely originate from the payment provider when its secret key has not been configured, which is its state immediately after activation, allowing unauthenticated attackers to change the status of arbitrary orders, including marking unpaid orders as paid and reducing stock.

Vulnerability class: Broken Authentication

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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-287 — Improper Authentication

References

wpscan.com/vulnerability/13767875-5010-494a-b3ed-133d58b8ecea/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-81740?: CVE-2026-81740 is a medium-severity vulnerability in Paytm Payment Gateway, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-10-02.
How severe is CVE-2026-81740?: Medium severity. CVSS v3 base score is 5.3 out of 10.