CVE-2021-26086
Exploited in the wild. In CISA KEV since 2024‑11‑12. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Atlassian Jira Data CenterAffected: ≥ unspecified, < 8.5.14Upgrade to: 8.5.14Affected: ≥ 8.6.0, < unspecifiedUpgrade to: unspecifiedAffected: ≥ unspecified, < 8.13.6Upgrade to: 8.13.6Affected: ≥ 8.14.0, < unspecifiedUpgrade to: unspecified + 1 more branchStated by: CVE record
- Atlassian Jira ServerAffected: ≥ unspecified, < 8.5.14Upgrade to: 8.5.14Affected: ≥ 8.6.0, < unspecifiedUpgrade to: unspecifiedAffected: ≥ unspecified, < 8.13.6Upgrade to: 8.13.6Affected: ≥ 8.14.0, < unspecifiedUpgrade to: unspecified + 1 more branchStated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
Coverage timeline
1 publisherAdvisory coverage
Added to CISA KEV catalog
Sourced from public security reporting — each date is when it was published, not when it happened.
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Listed as exploited in the wild since 2024-11-12.
US federal agencies must remediate by 2024-12-03.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Public exploits
1 source with a proof of concept or module.
Exploit links, PoCs and Metasploit modules after sign-in- EPSS
100% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
The patch came 133 days before any public exploit.
- OpenVAS check added
- Public exploit / PoCsource: packetstormnuclei check added
- Patch availablerecord updated
- Added to CISA KEV
- Publishedweakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Scored 5.3 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality LowSome restricted information is disclosed, but limited in scope
- Integrity NoneNo integrity impact
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
In the news
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