GHSA-g8wr-r2v2-vqc6: silverstripe/userforms (CVE-2026-54721)

Package	Ecosystem	Affected	Fixed in
silverstripe/userforms	Packagist	<6.4.9 \|\| >=7.0.0, <7.0.7 \|\| >=7.1.0, <7.1.1	6.4.9, 7.0.7, 7.1.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The silverstripe/userforms package is vulnerable to remote code execution through the email subject field in the CMS, affecting versions before 6.4.9, from 7.0.0 before 7.0.7, and from 7.1.0 before 7.1.1. The source does not say what privileges an attacker needs or how the payload is delivered, so the exact preconditions are unclear. Upgrade to version 6.4.9, 7.0.7, or 7.1.1, depending on the release line in use.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.8	High	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0073, the 54th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.