What is CVE-2021-39189?

CVE-2021-39189 is a medium-severity vulnerability in Pimcore, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2021-09-15.

How severe is CVE-2021-39189?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Pimcore

CVE-2021-39189

Pimcore is an open source data & experience management platform. In versions prior to 10.1.3, it is possible to enumerate usernames via the forgot password functionality. This issue is fixed in version 10.1.3. As a workaround, one may apply the available patch manually.

Published 2021-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (70.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.014 · change: +0.001

Affected products

Pimcore — versions < 10.1.3

Weakness classification (CWE)

References

github.com/pimcore/pimcore/security/advisories/GHSA-579x-cjvr-cqj9 (Third Party Advisory)
github.com/pimcore/pimcore/pull/10223.patch (Patch, Third Party Advisory)
github.com/pimcore/pimcore/pull/10223/commits/d0a4de39cf05dce6af71f8ca039132bdf… (Patch, Third Party Advisory)
huntr.dev/bounties/12462a99-ebf8-4e39-80b3-54a16caa3f4c/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-39189?: CVE-2021-39189 is a medium-severity vulnerability in Pimcore, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2021-09-15.
How severe is CVE-2021-39189?: Medium severity. CVSS v3 base score is 5.3 out of 10.