HighGHSA-g8wr-r2v2-vqc6CVE-2026-54721

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

Published 27 Aug 2026 · Updated 27 Aug 2026

Affected packages

silverstripe/userformsComposer

Affected: <6.4.9
Fixed in: 6.4.9

Update to the fixed version for your release line, for example:composer require silverstripe/userforms:^6.4.9

silverstripe/userformsComposer

Affected: >=7.0.0 <7.0.7
Fixed in: 7.0.7

Update to the fixed version for your release line, for example:composer require silverstripe/userforms:^7.0.7

silverstripe/userformsComposer

Affected: >=7.1.0 <7.1.1
Fixed in: 7.1.1

Update to the fixed version for your release line, for example:composer require silverstripe/userforms:^7.1.1

Details

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

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.