CVEs / CVE-2021-26086
CVE-2021-26086: Atlassian Jira Server and Data Center Path Traversal Vulnerability
- Known exploited in the CISA KEV catalog since 12 Nov 2024
- medium 5.3 CVSS 3.1 (NVD)
- EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2021-26086
Summary
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.
Description
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Atlassian Jira Server | from unspecified, before 8.5.14 | 8.5.14 |
| Atlassian Jira Server | from 8.6.0, before unspecified | unspecified |
| Atlassian Jira Server | from unspecified, before 8.13.6 | 8.13.6 |
| Atlassian Jira Server | from 8.14.0, before unspecified | unspecified |
| Atlassian Jira Server | from unspecified, before 8.16.1 | 8.16.1 |
| Atlassian Jira Data Center | from unspecified, before 8.5.14 | 8.5.14 |
| Atlassian Jira Data Center | from 8.6.0, before unspecified | unspecified |
| Atlassian Jira Data Center | from unspecified, before 8.13.6 | 8.13.6 |
| Atlassian Jira Data Center | from 8.14.0, before unspecified | unspecified |
| Atlassian Jira Data Center | from unspecified, before 8.16.1 | 8.16.1 |
| atlassian jira_server | before 8.5.14 | 8.5.14 |
| atlassian jira_server | from 8.6.0, before 8.13.6 | 8.13.6 |
| atlassian jira_server | from 8.14.0, before 8.16.1 | 8.16.1 |
| atlassian jira_data_center | before 8.5.14 | 8.5.14 |
| atlassian jira_data_center | from 8.6.0, before 8.13.6 | 8.13.6 |
| atlassian jira_data_center | from 8.14.0, before 8.16.1 | 8.16.1 |
Exploitation
| In CISA KEV since | 12 Nov 2024 |
|---|---|
| Due date for US federal agencies | 3 Dec 2024 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NScored by NVD |
|---|---|
| Weakness | CWE-22 |
References
- CVE-2021-26086 on NVD
- CVE-2021-26086 in the CISA KEV catalog
- https://jira.atlassian.com/browse/JRASERVER-72695 (cited by CISA)
- http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html Exploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/JRASERVER-72695 Issue Tracking, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.