How severe is CVE-2021-39170?

CVE-2021-39170 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39170 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39170?

CVE-2021-39170 affects Pimcore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39170?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39170 published?

CVE-2021-39170 was published on 2021-09-01 and last updated on 2026-06-17.

CVE-2021-39170

CVE-2021-39170 is a high-severity vulnerability in Pimcore with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 3.5
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Pimcore
Published: 2021-09-01
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-39170?: CVE-2021-39170 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39170 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39170?: CVE-2021-39170 affects Pimcore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39170?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39170 published?: CVE-2021-39170 was published on 2021-09-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pimcore:pimcore:*:*:*:*:*:*:*:*

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