Skip to content
Weekly Signal
Live intelligence Updated 20 Aug 2026 · 12:21 UTC

Atlassian · Jira Data Center, Jira Server, Jira Server and Data Center

CVE-2021-26086

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. Atlassian Security advisory JRASERVER 72695

View response plan
CVSS5.3
EPSS100.0%
KEVYes
ExploitationConfirmed exploitation
RemediationNot yet verified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 100.0%; technical severity is CVSS 5.3.

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.

Who should care

  • Teams operating Jira Data Center, Jira Server, Jira Server and Data Center
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Jira Data Center, Jira Server, Jira Server and Data Center is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Atlassian Security advisory JRASERVER 72695
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Advisory

Required Action

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
CWE-22
Affected versions
Atlassian Jira Data Center (End Excluding 8.5.14 | Start Including 8.6.0, End Excluding 8.13.6 | Start Including 8.14.0, End Excluding 8.16.1); Atlassian Jira Server (End Excluding 8.5.14 | Start Including 8.6.0, End Excluding 8.13.6 | Start Including 8.14.0, End Excluding 8.16.1); Atlassian Jira Server and Data Center
Fixed versions
Atlassian Jira Data Center (Fixed from 8.5.14, 8.13.6, 8.16.1); Atlassian Jira Server (Fixed from 8.5.14, 8.13.6, 8.16.1)
Published
15 August 2021
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 100.0%
  4. Signal calculated at 80

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.