Paytm Payment Gateway < 2.8.9 - Unauthenticated Stored XSS via Payment Callback (CVE-2026-81739) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-81739

Paytm Payment Gateway < 2.8.9 - Unauthenticated Stored XSS via Payment Callback

Answer in brief

CVE-2026-81739 records a Unknown severity vulnerability in Paytm Payment Gateway < 2.8.9 - Unauthenticated Stored XSS via Payment Callback. The current sources do not mark it as known exploited. The current feed maps Unknown/Paytm Payment Gateway (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Paytm Payment Gateway (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Paytm Payment Gatewaygeneric	>=0 <2.8.9	2.8.9

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Paytm Payment Gateway.
Review the reported fix. Update Unknown/Paytm Payment Gateway to 2.8.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.