CVE-2021-26072Confluence Data Center SSRF
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.
Published Apr 1, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-26072 is a medium-severity vulnerability (CVSS 4.3 v3.1) affecting Confluence Data Center (Atlassian), Confluence Server (Atlassian).
- It is exploited in the wild, listed in Industry KEV feed since Nov 5, 2025. No public exploit code is known.
- EPSS estimates a 41% probability of exploitation in the next 30 days.
- Fixed versions are available, including Confluence Data Center 5.8.6, Confluence Server 5.8.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
41%
Higher than 98.6% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
56/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Nov 5, 2025
1679 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 5, 2025 | n/a | Not reported |
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Confluence Data CenterAtlassian | >= unspecified | 5.8.6 |
| Confluence ServerAtlassian | >= unspecified | 5.8.6 |
Patched Releases
Confluence Data Center
5.8.6
Confluence Server
5.8.6
Timeline
Publicly disclosed
Apr 1, 2021
Last updated
Nov 21, 2024
Added to Industry KEV feed
Nov 5, 2025
Weakness Type
- CWE-918 Server-Side Request Forgery (SSRF)
References
FAQ
Common Questions.
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: Confluence Data Center (Atlassian) versions >= unspecified; Confluence Server (Atlassian) versions >= unspecified. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 5, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Confluence Data Center 5.8.6, Confluence Server 5.8.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2021-26072 On Your Attack Surface?
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