What is CVE-2021-20670?

CVE-2021-20670 is a high-severity vulnerability in Weseek Growi. CVSS score: 7.5/10. Published 2021-03-10.

How severe is CVE-2021-20670?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Weseek Growi

CVE-2021-20670

Improper access control vulnerability in GROWI versions v4.2.2 and earlier allows a remote unauthenticated attacker to read the user's personal information and/or server's internal information via unspecified vectors.

Published 2021-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.016 · change: +0.001

Affected products

Weseek Growi
Weseek, Inc. Growi — versions versions v4.2.2 and earlier

References

weseek.co.jp/security/2021/03/08/vulnerability/growi-prevent-multiple-xss/ (Vendor Advisory)
jvn.jp/en/vu/JVNVU94889258/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20670?: CVE-2021-20670 is a high-severity vulnerability in Weseek Growi. CVSS score: 7.5/10. Published 2021-03-10.
How severe is CVE-2021-20670?: High severity. CVSS v3 base score is 7.5 out of 10.