What is the CVSS score of CVE-2021-26072?

CVE-2021-26072 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 38.8%.

Is there a public PoC exploit available for CVE-2021-26072?

Yes, a public proof-of-concept exploit is available for CVE-2021-26072. Prioritise patching immediately. EPSS: 38.8%.

Is there a patch available for CVE-2021-26072?

Yes, a patch is available for CVE-2021-26072. Update the affected software to the latest version immediately.

Confluence Server CVE-2021-26072

MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2021-04-01 security@atlassian.com

SSRF Atlassian Confluence Data Center Confluence Server

4.3

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-918 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V4 - API and Web Service URL allowlisting, SSRF prevention MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 4.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could make the server perform requests to unintended internal or external resources by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 38.8% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. This Server-Side Request Forgery (SSRF) vulnerability could allow attackers to make the server perform requests to unintended internal or external resources.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate and allowlist destination URLs, block requests to internal networks, use network segmentation.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Server-Side Request Forgery (SSRF) (CWE-918), which allows attackers to make the server perform requests to unintended internal or external resources. 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. Affected products include: Atlassian Confluence Data Center, Atlassian Confluence Server. Version information: version 5.8.6.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

DescriptionNVD

Threat Intelligence Overview

EPSS Score

38.8%

Top 2% exploitable

Exploit

POC

Public exploit code exists

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS POC (1)

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC Yes

EPSS 38.8%

Patch available Yes

Active threat Yes

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +39

CVSS: +22

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Server-Side Request Forgery HIGH

Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.

Affected Products (CPE)NVD

cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*

cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*

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In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an un

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This High severity RCE (Remote Code Execution) vulnerability was introduced in version 5.2 of Confluence Data Center and

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A vulnerability in multiple Atlassian products allows a remote, unauthenticated attacker to bypass Servlet Filters used

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The WebDAV endpoint in Atlassian Confluence Server and Data Center before version 6.6.7 (the fixed version for 6.6.x), f

CVE-2021-26085 MEDIUM This Month POC

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Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authoriza

CVE-2024-21677 HIGH This Week

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This High severity Path Traversal vulnerability was introduced in version 6.13.0 of Confluence Data Center. Rated high s

CVE-2024-21673 HIGH This Week

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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)

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CVE-2021-21985 CRITICAL POC

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CVE-2024-21893 HIGH POC

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CVE-2021-40438 CRITICAL POC

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CVE-2021-22054 HIGH POC

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CVE-2021-21975 HIGH POC

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Same technique SSRF

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CVE-2016-3718 MEDIUM POC

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References

Advisories & patches

PATCH https://jira.atlassian.com/browse/CONFSERVER-61399

Search Externally

GitHub PoC

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