CVE-2021-26086 kev in the critical feed json
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerabili…
published 2021-08-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-12907
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Exploited
- added 2024-11-12
- epss
- 100.0%
- EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
- public exploits
- 1
- Exploit-DB, plus a Nuclei check
Summary
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.
Patch / fix
cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Atlassian Jira Server 8.5.14, 8.13.6, 8.16.1
- Atlassian Jira Data Center 8.5.14, 8.13.6, 8.16.1
- atlassian jira_server 8.5.14, 8.13.6, 8.16.1
- atlassian jira_data_center 8.5.14, 8.13.6, 8.16.1
Timeline
- Published
- First public exploit (EDB-50380)
- Added to CISA KEV
- CISA SSVC: exploitation active
- CISA patch deadline
Known exploited
- Added
- 23 mo ago
- Patch by
- 2024-12-03 (23 mo ago)
- Ransomware
- Not known
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Vendor, product
- Atlassian, Jira Server and Data Center
- CISA name
- Atlassian Jira Server and Data Center Path Traversal Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
100.00% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-50380 Atlassian Jira Server Data Center 8.16.0 - Arbitrary File Read webapps, 2021-10-06
- Nuclei template Atlassian Jira Limited - Local File Inclusion nuclei detection template
- packetstormsecurity.com http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Atlassian Jira Server
- Atlassian Jira Data Center
- atlassian jira_server
- atlassian jira_data_center
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
packetstormsecurity.com
/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html
exploit, third-party-advisory, vdb-entry
-
jira.atlassian.com
/browse/JRASERVER-72695
issue-tracking, vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086
government-resource, us-government-resource
Sources
- CVE List CVE-2021-26086
- NVD CVE-2021-26086
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.