Welcart e-Commerce permits unauthenticated customer session fixation
Welcart e-Commerce before 2.12.1 accepts a session identifier from an attacker-controlled request parameter and does not regenerate that identifier when the customer authenticates. An unauthenticated attacker can send a victim a crafted login request that fixes the shop session, then reuse the known identifier after the victim signs in to take over the customer's account.
- Component
- Welcart e-Commerce
- Plugin slug
usc-e-shop- Affected
- < 2.12.1
- Safe version
2.12.1- Published
- Aug 21, 2026
This CVE was published Aug 21, 2026 and is one of 18 known issues for this plugin.
Update, patch or deactivate.
Update Welcart e-Commerce to 2.12.1 or later. Invalidate customer sessions and review customer-account, order and login activity for unauthorized access following crafted inbound links.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Welcart e-Commerce WordPress plugin before 2.12.1 does not regenerate the session identifier on authentication and sets the session identifier from a user-supplied request parameter, allowing an unauthenticated attacker to fixate a shop member's session and take over their customer account after the victim logs in through an attacker-crafted request.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N