Cyber Resilience

CVE-2021-26072

Medium

Published: 01 April 2021

Published
01 April 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.1755 95.2th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26072 is a medium-severity SSRF (CWE-918) vulnerability in Atlassian Confluence Data Center. Its CVSS base score is 4.3 (Medium).

Operationally, ranked in the top 4.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

The WidgetConnector plugin in Confluence Server and Confluence Data Center before version 5.8.6 allowed remote attackers to manipulate the content of internal network resources via a blind Server-Side Request Forgery (SSRF) vulnerability.

CWE(s)
CWE-918

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

atlassian
confluence data center
≤ 5.8.6
atlassian
confluence server
≤ 5.8.6

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-918

Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.

SC-7 Boundary Protection
addresses: CWE-918

Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.

SI-10 Information Input Validation
addresses: CWE-918

Validates server-side URLs and resource references to block SSRF attempts.

SI-4 System Monitoring
addresses: CWE-918

Detects server-side request forgery through monitoring of unexpected outbound connections.

References