CVE-2026-19887
HighThe Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction).
Published Sep 5, 2026 · Updated Sep 8, 2026 · Also known as 716a7c3c-2e26-4da9-a299-7dcbaa7e4895, EUVD-2026-71883, GHSA-fq25-6gpx-5vxf
Key Facts
Patch in the next maintenance window- CVE-2026-19887 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting usc-e-shop (wordpress-plugin), Welcart e-Commerce.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 0.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including usc-e-shop 2.12.2.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
0.6%
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
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Description
The Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction). Unauthenticated attackers can store arbitrary 'reserve' key/value pairs as order metadata during a public checkout, then invoke the callback with an attacker-chosen 'option' parameter to select and unserialize that metadata without any provider signature, source-address, transaction-identity or ownership check. A POP chain is present in the TCPDF library bundled with the plugin itself, so no additional plugin or theme is required. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, including wp-config.php, which can lead to remote code execution when an attacker re-runs the WordPress installer against a database they control. Successful exploitation is contingent on an admin printing an invoice to trigger file deletion.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| usc-e-shopwordpress-plugin | See advisory | 2.12.2 |
| Welcart e-Commerce | See advisory | n/a |
Patched Releases
usc-e-shop
2.12.2
Timeline
Publicly disclosed
Sep 5, 2026
Last updated
Sep 8, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://patchstack.com/database
- advisoryhttps://wpscan.com/plugins/
- advisoryUSOM advisory
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/716a7c3c-2e26-4da9-a299-7dcbaa7e4895?source=api-prod
FAQ
Common Questions.
The Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction).
Affected: usc-e-shop (wordpress-plugin); Welcart e-Commerce. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including usc-e-shop 2.12.2.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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