CVE-2021-26086

CVE Enrichment

CVSS: 5.3 MEDIUM
EPSS: 100.00%
EPSS Percentile: 99.99%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security@atlassian.com
Published: 16-Aug-2021 08:15
Last Modified: 17-Jun-2026 10:42
EPSS Date: 2026-10-10
CWE: CWE-22

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:L /
                            I:N /
                            A:N

CISA KEV Details

Date Added: 2024-11-12
Remediation Due: 2024-12-03
Known Ransomware Campaign Use: Unknown
Required Action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes: https://jira.atlassian.com/browse/JRASERVER-72695 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26086

Affected Products / Versions

atlassian / jira_data_center
Version / affected range: * · before (exclusive) 8.5.14
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian / jira_data_center
Version / affected range: * · from (inclusive) 8.6.0 · before (exclusive) 8.13.6
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian / jira_data_center
Version / affected range: * · from (inclusive) 8.14.0 · before (exclusive) 8.16.1
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
atlassian / jira_server
Version / affected range: * · before (exclusive) 8.5.14
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
atlassian / jira_server
Version / affected range: * · from (inclusive) 8.6.0 · before (exclusive) 8.13.6
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
atlassian / jira_server
Version / affected range: * · from (inclusive) 8.14.0 · before (exclusive) 8.16.1
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*

References

Last enrichment sync: 11-Oct-2026 16:09
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

Attackers have exploited this kind of flaw in an Atlassian product before. CVE-2021-26086 is a path traversal vulnerability in Jira Server and Data Center that allows remote attackers to read specific files. The U.S. Critical Atlassian Flaw Allows Unauthenticated File Reads Across Eight Self-Hosted Products

CVE (1)

Vendors (1)

Products (8)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.