Security readout for executives and security teams
Plain-English summary
This CVE describes a reported template-injection flaw in Form.io 2.0.0 that could lead to code execution through legacy email template handling. The business risk is potentially severe for old deployments, but the record includes important caveats: the vendor disputes the issue, says it is sandboxed and admin-only, and notes the email templating service was removed after 2020.
Executive priority
Prioritize discovery and containment for any legacy Form.io deployment. Do not assume broad exposure without confirming the old email templating component exists, but treat confirmed vulnerable legacy instances as urgent because the reported impact is code execution.
Technical view
The CVE record reports Server-Side Template Injection in Form.io 2.0.0, tied to deletion of the default Email template URL, with claimed Remote Code Execution impact. CVSS is 9.8 critical. Evidence is conflicted: the vendor reportedly disputes exploitation scope, stating the behavior is sandboxed and only executable by admins.
Likely exposure
Likely exposure is limited to legacy Form.io 2.0.0 environments using the former email templating service. The supplied data does not identify affected CPEs, maintained versions, cloud offerings, or downstream packages.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVE text claims RCE, but also states the vendor disputes the issue and considers it sandboxed/admin-only. Treat exploitation evidence as incomplete.
Researcher notes
Key uncertainty is the conflict between the CVSS vector and vendor dispute. The CVE says no privileges are required, while the note says admin-only and sandboxed. Validate product version, component presence, and administrative reachability before rating local exposure.
Mitigation direction
- Identify any Form.io 2.0.0 or legacy Form.io API Server deployments.
- Check vendor changelog and current guidance before choosing a remediation path.
- Remove or upgrade away from the legacy email templating service where applicable.
- Restrict administrative access to trusted users only.
- Review template-management permissions and audit logging.
Validation and detection
- Inventory internet-facing and internal Form.io instances and versions.
- Confirm whether the removed email templating service exists in each deployment.
- Review admin accounts with template or email configuration permissions.
- Check logs for suspicious template changes or deletions.
- Verify CISA KEV and vendor advisories for new exploitation evidence.
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
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ATT&CK lookup starting points
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CWE-74: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-28246 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/formio/formioCVE reference
- https://github.com/formio/enterprise-release/blob/master/API-Server-Change-Log.mdCVE reference
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.
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.