CVE-2026-81739 Paytm Payment Gateway < 2.8.9 - Unauthenticated Stored XSS via Payment Callback
Unauthenticated attackers can inject scripts into admin pages via forged payment callbacks when the gateway lacks credentials, risking administrator session takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81739?
CVE-2026-81739 is a high-severity cross-site scripting vulnerability in Unknown Paytm Payment Gateway, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-81739?
How do I fix CVE-2026-81739?
No fix has been published for CVE-2026-81739 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-81739 being exploited?
There is no known exploitation of CVE-2026-81739 in the wild and no public exploit code.
Sources
Also known as GHSA-hxqp-r3vv-h45f.