Vulnerability in Opencart
CVE-2021-47923
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (34.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Opencart — versions 3.0.3.8
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50555 (exploit)
- www.opencart.com/ (product)
- www.vulncheck.com/advisories/opencart-session-fixation-via-ocsessid-cookie (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47923?
- CVE-2021-47923 is a critical-severity vulnerability in Opencart, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-05-10.
- How severe is CVE-2021-47923?
- Critical severity. CVSS v3 base score is 9.8 out of 10.