CVE-2021-26086

Name: CVE-2021-26086
Creator: NVD / NIST
Published: 2021-08-16T01:15:06.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10Actively ExploitedEPSS 100.00%

Last modified Jun 17, 2026

CVE-2021-26086 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 100.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

100.00%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Dec 3, 2024.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Atlassian	Jira Data Center	< 8.5.14
Atlassian	Jira Data Center	>= 8.6.0, < 8.13.6
Atlassian	Jira Data Center	>= 8.14.0, < 8.16.1
Atlassian	Jira Server	< 8.5.14
Atlassian	Jira Server	>= 8.6.0, < 8.13.6
Atlassian	Jira Server	>= 8.14.0, < 8.16.1

References

http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.htmlExploit, Third Party Advisory, VDB Entry
https://jira.atlassian.com/browse/JRASERVER-72695Issue Tracking, Vendor Advisory
http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.htmlExploit, Third Party Advisory, VDB Entry
https://jira.atlassian.com/browse/JRASERVER-72695Issue Tracking, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086US Government Resource

Timeline

Published: Aug 16, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-26086?

How severe is CVE-2021-26086?

CVE-2021-26086 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 100.00% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-26086?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26086?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST