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Reflected XSS via DataTable Form Widget

Low
daftspunk published GHSA-jj38-h5w5-mvpf Apr 21, 2026

Package

composer october/system (Composer)

Affected versions

<=3.7.15, <=4.1.15

Patched versions

3.7.16, 4.1.16

Description

A reflected Cross-Site Scripting (XSS) vulnerability was identified in the backend DataTable widget where a query parameter was rendered without proper output escaping.

Impact

  • Reflected XSS only, no stored/persistent component
  • The backend URL prefix is customizable and must be known or guessed by the attacker
  • Requires an authenticated backend user to visit a crafted URL
  • No direct access is gained without social engineering

Patches

The vulnerability has been patched in v3.7.16 and v4.1.16. The affected parameter is now properly escaped. All users are encouraged to upgrade to the latest patched version.

Workarounds

  • Use a non-default backend URL prefix (recommended as standard practice)
  • Implement a Content Security Policy (CSP) for backend pages

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

CVE ID

CVE-2026-27937

Weaknesses

No CWEs

Credits