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CVE-2026-54721 — Vulnerability in silverstripe/userforms — CVE Details

HIGH

silverstripe/userforms vulnerable to remote code execution via userforms email subject

Published August 27, 2026Updated August 27, 2026Source: osv

Summary

### Impact The userform email subject field in the CMS is vulnerable to a specially crafted payload being used to run arbitrary code on the server. ### Reported by Jack Wallace from Bastion Security

Advisory Timeline

  • First published August 27, 2026 (46 days ago).
  • Last revised August 27, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update silverstripe/userforms to 6.4.9 or later
composer require "silverstripe/userforms:^6.4.9"
Composer
Update silverstripe/userforms to 7.0.7 or later
composer require "silverstripe/userforms:^7.0.7"
Composer
Update silverstripe/userforms to 7.1.1 or later
composer require "silverstripe/userforms:^7.1.1"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
silverstripe/userforms
packagist
0.5.1, 1.0.1, 1.1.0-beta, 2.0.1 (+168 more)6.4.9
silverstripe/userforms
packagist
7.0.0, 7.0.1, 7.0.2, 7.0.3 (+3 more)7.0.7
silverstripe/userforms
packagist
7.1.07.1.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-20
    Improper Input ValidationMITRE
  • CWE-94
    Code InjectionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-54721?
silverstripe/userforms vulnerable to remote code execution via userforms email subject This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2026-54721?
CVE-2026-54721 affects silverstripe/userforms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54721 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-g8wr-r2v2-vqc6

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