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01 Record

CVE-2021-26086

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

MediumKEVPUBLISHEDCNA: atlassian
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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02 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

03 Exploitation and scoring

Exploitation
Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2024-11-12. Federal remediation due 2024-12-03.
SSVC decision
  • ExploitationactiveCISA reports credible evidence of active exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
99.99% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-08-16 00:15Z5 YR AGO
Last updated
2025-10-21 23:25Z1 YR AGO
Reserved
2021-01-25
Assigning CNA
atlassian
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
  • CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base
Data version
5.1
Document digest
6a217be0480bd69bb3bc139fc6e9e17dbdb1c334fd7ecffad683da00a7b753ed

05 Affected products

VendorProductVersionsPlatforms
AtlassianJira Server< 8.5.14, 8.6.0 to < unspecified, < 8.13.6, 8.14.0 to < unspecified, < 8.16.1—
AtlassianJira Data Center< 8.5.14, 8.6.0 to < unspecified, < 8.13.6, 8.14.0 to < unspecified, < 8.16.1—
atlassianjira_server0 to < 8.5.14, 8.6.0 to < 8.13.6, 8.14.0 to < 8.16.1—
atlassianjira_data_center0 to < 8.5.14, 8.6.0 to < 8.13.6, 8.14.0 to < 8.16.1—

06 References