Is CVE-2021-26086 in the CISA KEV catalog?

Yes. CVE-2021-26086 is on the CISA Known Exploited Vulnerabilities list, added 2024-11-12.

What is the CVSS severity of CVE-2021-26086?

CVE-2021-26086 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-26086?

CVE-2021-26086 has an EPSS score of 100.00% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26086?

Upgrade jira data center to 8.16.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26086

MEDIUMCISA KEVEPSS 100th pctl

5.3

CVSS v3

NVD

Description

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

CWE-22Path Traversal

How to fix

Remediation Available

jira data centerNVD

Affected:>= 8.14.0, < 8.16.1Fixed in:8.16.1CVE-2021-26086derived from NVD

jira serverNVD

Affected:>= 8.14.0, < 8.16.1Fixed in:8.16.1CVE-2021-26086derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

100.00%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2024-12-03

References

Exploit1

packetstormsecurity.com

Vendor Advisory1

jira.atlassian.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-22 (Path Traversal) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-23897	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-32315	High	8.6	100%	KEV	Fix
CVE-2022-29464	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22005	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-5902	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-19781	Critical	9.8	100%	KEV + Ransom	-

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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 2025-10-24.