CVE-2026-54721High· 8.8▾ TwilightSilverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted a…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 28.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
0.4% → 0.7%
Silverstripe UserForms provides a visual form builder for the Silverstripe CMS. From 6.0.0 until 6.4.9, 7.0.7, and 7.1.1, the userform email recipient subject field in the CMS accepts a specially crafted payload that can be interpreted as executable server-side code. An authenticated CMS user with permission to configure a UserForms email recipient can use the subject field to run arbitrary code on the server, compromising confidentiality, integrity, and availability. This issue is fixed in versions 6.4.9, 7.0.7, and 7.1.1.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
silverstripe/userforms < 6.4.9silverstripe/userforms >= 7.0.0, < 7.0.7silverstripe/userforms >= 7.1.0, < 7.1.1Patched in:
silverstripe/userforms 6.4.9silverstripe/userforms 7.0.7silverstripe/userforms 7.1.1Connected by shared product, vendor, weakness, or advisory.
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