Welcart e-Commerce <= 2.12.2 - Unauthenticated Stored Cross-Site Scripting via Settlement Notification Parameters
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-03 Threatist record created from CVE-2026-87091
- 2026-10-03 Alias added: GHSA-75wc-wvc7-9m96
- 2026-10-03 CISA SSVC decision points changed
References
Other 11
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d6046c06-9a77-450f-9cdf-c5239e73cb6b?source=cve
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L906
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L951
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/hoock_func.php#L631
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L569
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L906
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L951
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/hoock_func.php#L631
- https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L569
- https://plugins.trac.wordpress.org/changeset/3690880/usc-e-shop
- https://plugins.trac.wordpress.org/changeset/3690880/usc-e-shop/trunk/functions/settlement_func.php
More uscnanbu vulnerabilities
- TI-2023-05484 Welcart e-Commerce < 2.9.5 - Subscriber+ Arbitrary File Upload CVSS 3.1HIGH 8.8
- TI-2022-03880 Welcart e-Commerce < 2.8.6 - Subscriber+ PHAR Deserialisation CVSS 3.1HIGH 8.8
- TI-2022-03786 Welcart e-Commerce < 2.8.5 - Unauthenticated Arbitrary File Access CVSS 3.1HIGH 7.5
- TI-2026-84126 Cross-site scripting in Welcart e-Commerce Plugin payment error page CVSS 4.0MEDIUM 5.3
- TI-2022-03879 Welcart e-Commerce < 2.8.5 - Subscriber+ Arbitrary File Access CVSS 3.1MEDIUM 6.5
- TI-2022-03618 Welcart e-Commerce < 2.8.4 - Subscriber+ Arbitrary Shipping Method Creation/Update/Deletion CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-87091 · CVE Program
- CVE-2026-87091 · NVD
- FIRST EPSS
- GHSA-75wc-wvc7-9m96 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences