CISA KEV · Known exploitedMedium

CVE-2021-26086

Atlassian Jira Server and Data Center

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.

CVSS
5.3
EPSS
100.0%
100.0% percentile
CISA KEV
Listed
Published
2021.08.16
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability100.0%
Technical severityCVSS 5.3

Vulnerability overview

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.

Affected product and versions

Product
Atlassian Jira Server and Data Center
Affected versions
unspecified, 8.6.0, 8.14.0, < 8.5.14, >= 8.6.0 < 8.13.6, >= 8.14.0 < 8.16.1
Fixed versions
8.5.14, 8.13.6, 8.16.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

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

Due date: 2024.12.03
  1. 1
    Identify

    Confirm that Atlassian Jira Server and Data Center and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
CWE-22
KEV added
2024.11.12
Ransomware use
미확인
CVE-2021-26086 — Atlassian Jira Server and Data Center | SECUFOCUS NOW