What is CVE-2021-39170?

CVE-2021-39170 is a high-severity vulnerability in Pimcore, classified under Improper Encoding or Escaping of Output. CVSS score: 8.0/10. Published 2021-09-01.

How severe is CVE-2021-39170?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Pimcore

CVE-2021-39170

Pimcore is an open source data & experience management platform. Prior to version 10.1.2, an authenticated user could add XSS code as a value of custom metadata on assets. There is a patch for this issue in Pimcore version 10.1.2. As a workaround, users may apply the patch manually.

Published 2021-09-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.1th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Pimcore — versions < 10.1.2

Weakness classification (CWE)

References

github.com/pimcore/pimcore/security/advisories/GHSA-2v88-qq7x-xq5f (Patch, Third Party Advisory)
github.com/pimcore/pimcore/pull/10178 (Patch, Third Party Advisory)
github.com/pimcore/pimcore/pull/10178.patch (Patch, Third Party Advisory)
huntr.dev/bounties/e4cb9cd8-89cf-427c-8d2e-37ca40099bf2/ (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-39170?: CVE-2021-39170 is a high-severity vulnerability in Pimcore, classified under Improper Encoding or Escaping of Output. CVSS score: 8.0/10. Published 2021-09-01.
How severe is CVE-2021-39170?: High severity. CVSS v3 base score is 8.0 out of 10.