How severe is CVE-2021-21619?

CVE-2021-21619 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-21619 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21619?

CVE-2021-21619 affects Jenkins Claim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21619?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21619 published?

CVE-2021-21619 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-21619

CVE-2021-21619 is a medium-severity vulnerability in Jenkins Claim with a CVSS 3.x base score of 5.4. 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: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jenkins Claim
Published: 2021-02-24
Last modified: 2026-06-17

Description

Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins.

Frequently asked questions

What is CVE-2021-21619?: Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins.
How severe is CVE-2021-21619?: CVE-2021-21619 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-21619 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21619?: CVE-2021-21619 affects Jenkins Claim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21619?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21619 published?: CVE-2021-21619 was published on 2021-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:claim:*:*:*:*:*:jenkins:*:*

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