How severe is CVE-2021-4139?

CVE-2021-4139 has a CVSS 3.x base score of 9.0, rated critical 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-2021-4139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4139?

CVE-2021-4139 affects Pimcore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4139?

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

When was CVE-2021-4139 published?

CVE-2021-4139 was published on 2021-12-21 and last updated on 2026-06-17.

CVE-2021-4139

CVE-2021-4139 is a critical-severity vulnerability in Pimcore with a CVSS 3.x base score of 9.0. 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: Critical (CVSS 3.x base score 9.0)
CVSS v2: 6.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Pimcore
Published: 2021-12-21
Last modified: 2026-06-17

Description

pimcore is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Frequently asked questions

What is CVE-2021-4139?: pimcore is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
How severe is CVE-2021-4139?: CVE-2021-4139 has a CVSS 3.x base score of 9.0, rated critical 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-2021-4139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4139?: CVE-2021-4139 affects Pimcore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-4139 published?: CVE-2021-4139 was published on 2021-12-21 and last updated on 2026-06-17.

References

Affected products (1)

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

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