Answer in brief
CVE-2026-54721 records a High severity (CVSS 8.8) vulnerability in silverstripe/userforms vulnerable to remote code execution via userforms email subject. The current sources do not mark it as known exploited. The current feed maps silverstripe/userforms (composer), silverstripe/userforms (composer), silverstripe/userforms (composer). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps silverstripe/userforms (composer), silverstripe/userforms (composer), silverstripe/userforms (composer). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| silverstripe/userformscomposer | <6.4.9 | 6.4.9 |
| silverstripe/userformscomposer | >=7.0.0,<7.0.7 | 7.0.7 |
| silverstripe/userformscomposer | >=7.1.0,<7.1.1 | 7.1.1 |
Published upstream
Aug 27, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 27, 2026
### 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
Quoted source text, attributed separately from HOL analysis.