Security readout for executives and security teams
Plain-English summary
This flaw affected Atlassian Confluence Server and Data Center through the WidgetConnector plugin. A remote attacker could cause Confluence to make blind server-side requests that affect internal network resources. The public bundle does not provide severity scoring, authentication requirements, or confirmed exploitation.
Executive priority
Prioritize discovery and remediation for externally reachable Confluence systems, especially where Confluence can access internal services. Urgency is constrained by missing severity and exploitation evidence, but SSRF into internal networks can create meaningful business risk.
Technical view
CVE-2021-26072 is a blind SSRF in the Confluence WidgetConnector plugin affecting Confluence Server and Confluence Data Center before version 5.8.6, per the supplied description. Impact is described as manipulation of internal network resource content. No CVSS, CWE, detailed prerequisites, or proof-of-exploitation data are included.
Likely exposure
Organizations running Atlassian Confluence Server or Confluence Data Center with the affected WidgetConnector plugin before version 5.8.6 may be exposed. Internet-facing Confluence instances would carry higher practical concern, but exposure details are not confirmed in the supplied sources.
Exploitation context
The source bundle says KEV is false and provides no cited evidence of active exploitation. Treat this as a remotely reachable SSRF risk, not as a confirmed exploited vulnerability, unless Atlassian or another cited source states otherwise.
Researcher notes
Evidence is limited to the CVE description and Atlassian issue reference. The bundle does not include CVSS, CWE, authentication state, exploitability details, affected exact Confluence versions, or vendor remediation text beyond the before-5.8.6 statement.
Mitigation direction
- Inventory Confluence Server and Data Center instances and WidgetConnector plugin versions.
- Review Atlassian CONFSERVER-61399 for the applicable fixed version guidance.
- Upgrade affected deployments to version 5.8.6 or later where applicable.
- Restrict Confluence server egress to required internal and external destinations.
- Monitor Atlassian guidance for additional remediation or configuration advice.
Validation and detection
- Confirm whether WidgetConnector is present and below version 5.8.6.
- Verify all Confluence Server and Data Center deployments are included in asset inventory.
- Check whether Confluence can reach sensitive internal network resources.
- Review logs for unusual Confluence-originated internal requests.
- Document remaining exposure where version or plugin status cannot be confirmed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Cloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26072 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.atlassian.com/browse/CONFSERVER-61399CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.