CVE-2026-54721Silverstripe UserForms: Remote code execution via userforms email subject
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
silverstripe silverstripe-userforms silverstripe:userforms (from the name) | before 6.4.9; from 7.0.0, < 7.0.7; from 7.1.0, < 7.1.1 | CNA record |
References
- https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6x-refsource-confirm
- https://github.com/silverstripe/silverstripe-userforms/pull/1441x-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/pull/1442x-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702x-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604cx-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9x-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7x-refsource-misc
- https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.