CVE-2021-26086 on CISA KEV

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

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

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

03Notes & references

• jira.atlassian.com — https://jira.atlassian.com/browse/JRASERVER-72695
• packetstormsecurity.com — http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Atlassian	Jira Server	unspecified, 8.6.0, unspecified, 8.14.0, unspecified
Atlassian	Jira Data Center	unspecified, 8.6.0, unspecified, 8.14.0, unspecified

06Detection

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