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CVE-2021-26086: Atlassian Jira Server and Data Center Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2021-26086
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.

CSIRTS triage

vendor: Atlassianproduct: Jira Server and Data CenterPath traversal
What
Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files.
Who is affected
Remote attackers targeting affected versions of Jira Server and Data Center.
Urgency
Remediation is critical due to active exploitation and the severity of the vulnerability.
Action
Update to the latest version of Jira to address the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2024-11-12
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-26086

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-26086coverage & exploitation statusNVD · CVE.org

Recent advisories for Atlassian Jira Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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