What is CVE-2021-31631?

CVE-2021-31631 is a high-severity vulnerability in B2evolution Cms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-12-06.

How severe is CVE-2021-31631?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in B2evolution Cms

CVE-2021-31631

b2evolution CMS v7.2.3 was discovered to contain a Cross-Site Request Forgery (CSRF) via the User login page. This vulnerability allows attackers to escalate privileges.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-12-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (43.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

B2evolution Cms — versions 7.2.3

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

gist.github.com/stacksmasher007/76514ab2b782fb4383f1121e6fc19241 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31631?: CVE-2021-31631 is a high-severity vulnerability in B2evolution Cms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-12-06.
How severe is CVE-2021-31631?: High severity. CVSS v3 base score is 8.8 out of 10.