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Connect CMS has Stored Cross-site Scripting (XSS) in the File Field of its Form Plugin

High severity GitHub Reviewed Published Mar 23, 2026 in opensource-workshop/connect-cms • Updated Mar 23, 2026

Package

composer opensource-workshop/connect-cms (Composer)

Affected versions

<= 1.41.0
>= 2.0.0, <= 2.41.0

Patched versions

1.41.1
2.41.1

Description

Security Advisory — Form Plugin (Stored XSS)

Summary

A Stored Cross-site Scripting (XSS) issue exists in the file field of the Form Plugin.

Affected Versions

  • 1.x series: <= 1.41.0
  • 2.x series: <= 2.41.0

Patched Versions

  • 1.41.1
  • 2.41.1

Description

In the file field of the Form Plugin, Stored Cross-site Scripting (XSS) could occur. If exploited, arbitrary script could run in an administrator's browser, which may lead to unauthorized actions or information theft. Users affected by this vulnerability should update to a fixed version.

Solution

Update to the fixed version.
For the 1.x series, update to 1.41.1 or later.
For the 2.x series, update to 2.41.1 or later.

Credits

OpenSource WorkShop thanks Sho Odagiri (小田切 祥) of GMO Cybersecurity by Ierae, Inc. for reporting this vulnerability.

References

@gakigaki gakigaki published to opensource-workshop/connect-cms Mar 23, 2026
Published to the GitHub Advisory Database Mar 23, 2026
Reviewed Mar 23, 2026
Last updated Mar 23, 2026

Severity

High

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
Changed
Confidentiality
High
Integrity
High
Availability
Low

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:C/C:H/I:H/A:L

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(11th percentile)

Weaknesses

Unrestricted Upload of File with Dangerous Type

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. Learn more on MITRE.

CVE ID

CVE-2026-32278

GHSA ID

GHSA-mv3p-7p89-wq9p

Source code

Credits

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