CVE-2026-87091 Welcart e-Commerce <= 2.12.2 - Unauthenticated Stored Cross-Site Scripting via Settlement Notification Parameters
Unauthenticated attackers can inject malicious scripts via settlement notification parameters, leading to code execution in admin views.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-87091?
CVE-2026-87091 is a high-severity cross-site scripting vulnerability in uscnanbu Welcart e-Commerce, published on 3 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Settlement Notification Parameters in all versions up to, and including, 2.12.2 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. The IPN endpoint accepts the 'rel' and 'option' parameters with no authentication, nonce validation, or signature verification, meaning any unauthenticated attacker can directly submit malicious payloads that are stored and later rendered in the administrator's settlement error log view.
Weakness: CWE-79
Which versions are affected by CVE-2026-87091?
How do I fix CVE-2026-87091?
No fix has been published for CVE-2026-87091 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-2026-87091 being exploited?
There is no known exploitation of CVE-2026-87091 in the wild and no public exploit code.
Sources
Also known as GHSA-75wc-wvc7-9m96.