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CVE-2021-26086

MEDIUM
5.3
CVSS Score
Published: August 16, 2021 at 12:15 AM UTC
Updated: June 17, 2026 at 03:42 AM UTC
2 products affected across 1 vendorJira ServerJira Data Center

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Severity
MEDIUM5.3
Exploitation
CISA KEV
Exploit prediction
EPSS 100%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score100.0%

EPSS (Exploit Prediction Scoring System) estimates a 100.0% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Nov 12, 2024
Remediation Due
Dec 3, 2024
696 days overdue
Notes
https://jira.atlassian.com/browse/JRASERVER-72695
https://nvd.nist.gov/vuln/detail/CVE-2021-26086

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jira Data Center· Atlassianatlassian-app
95%
v ≥ 8.14.0v ≥ 8.6.0v < 8.13.6v < 8.16.1v < 8.5.148.14.0 ≤ v < 8.16.18.6.0 ≤ v < 8.13.68.14.08.6.0
Affected range stops below 8.13.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.14, so it looks safe — our inference, not a vendor statement
Jira Server· Atlassianatlassian-app
95%
v ≥ 8.14.0v ≥ 8.6.0v < 8.13.6v < 8.16.1v < 8.5.148.14.0 ≤ v < 8.16.18.6.0 ≤ v < 8.13.68.14.08.6.0
Affected range stops below 8.13.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.14, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://jira.atlassian.com/browse/JRASERVER-72695
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-22

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