Is CVE-2021-39878 in the CISA KEV catalog?

No. CVE-2021-39878 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39878?

CVE-2021-39878 has a CVSS v3 base score of 5.8 (MEDIUM).

What is the EPSS score for CVE-2021-39878?

CVE-2021-39878 has an EPSS score of 0.78% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39878?

Upgrade gitlab on debian unstable to 15.10.8+ds1-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-39878

MEDIUM

5.8

CVSS v3

NVD

Description

A stored Reflected Cross-Site Scripting vulnerability in the Jira integration in GitLab version 13.0 up to 14.3.1 allowed an attacker to execute arbitrary javascript code.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

gitlabDebian

Fixed in:15.10.8+ds1-2CVE-2021-39878

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Exploit Intelligence

0.78%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Vendor Advisory1

gitlab.com

Other references2

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.