Known exploited vulnerability
CVE-2021-26086
The short answer
CVE-2021-26086 affects Atlassian Jira Server and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2024-11-12: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-22.
Severity
5.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploited (CISA KEV)
Yes, since Nov 12, 2024
Federal due date Dec 3, 2024
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
Jira Server, Jira Data Center, jira_server, jira_data_center. NVD's record lists the exact affected versions.
References
- jira.atlassian.com/browse/JRASERVER-72695 Issue TrackingVendor Advisory
- jira.atlassian.com/browse/JRASERVER-72695 Issue TrackingVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086 US Government Resource
Questions
Is CVE-2021-26086 being exploited?
Yes. CISA added CVE-2021-26086 to its Known Exploited Vulnerabilities catalog on 2024-11-12, with a federal remediation due date of 2024-12-03.
How do I fix CVE-2021-26086?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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