LiveActive security incident?Get immediate response
CVE Record

CVE-2020-26138: In SilverStripe through 4.6.0-rc1, a FormField with square brackets in the field name skips validation.

In SilverStripe through 4.6.0-rc1, a FormField with square brackets in the field name skips validation.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

SilverStripe had a form validation weakness where fields named with square brackets could skip validation. For a business, the risk depends on whether affected SilverStripe forms enforce important rules such as required fields, approval gates, or data integrity checks. The sources do not provide severity, CVSS, active exploitation, or detailed impact evidence.

Executive priority

Prioritize this where SilverStripe forms enforce business-critical controls, collect regulated data, or trigger approvals. If SilverStripe is not present, business exposure is unlikely. Evidence is incomplete, so assign remediation based on asset criticality rather than public exploit activity.

Technical view

CVE-2020-26138 affects SilverStripe through 4.6.0-rc1. The reported condition is that a FormField using square brackets in its field name skips validation. Available source data does not name a CWE, CVSS score, fixed version, exploit status, or affected CPEs beyond the stated SilverStripe version range.

Likely exposure

Exposure is most likely in SilverStripe deployments through 4.6.0-rc1, especially sites with custom forms or modules that use bracketed FormField names and rely on server-side validation for security or workflow controls.

Exploitation context

The source bundle states the validation bypass condition, but does not provide exploit details. CISA KEV status is false, and no cited source in the bundle supports active exploitation. Treat exploit status as unconfirmed.

Researcher notes

The public record is sparse: no CVSS, CWE, CPE, fixed release, or exploitation evidence is included in the provided bundle. Validate against the SilverStripe advisory and release notes before making version-specific remediation claims.

Mitigation direction

  • Review SilverStripe security release guidance for the applicable fixed version.
  • Upgrade affected SilverStripe deployments according to vendor guidance.
  • Audit custom forms for bracketed FormField names.
  • Avoid relying only on client-side form validation.
  • Add regression coverage for required server-side validators.

Validation and detection

  • Inventory SilverStripe versions across production and staging.
  • Identify deployments running through 4.6.0-rc1.
  • Review form definitions for square brackets in field names.
  • Confirm critical validators execute on submitted forms.
  • Check tests cover bracketed field-name validation behavior.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

cve · low confidence lookup

CVE-2020-26138 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.