← Vulnerability feed

Vulnerability record · CVE-2026-54721 · published 27 August 2026

CVE-2026-54721: Code injection vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.73% · top 47.5% CWE-94 · Code injection Deferred
8.8CVSS 3.1 base score
0.73%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
9 Sep 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/silverstripe/silverstripe-userforms/commit/23c069866900c19b499bfa997d1e251e97491702
https://github.com/silverstripe/silverstripe-userforms/commit/c55494ad7c717b199a3c1663b43a54db5d95604c
https://github.com/silverstripe/silverstripe-userforms/pull/1441
https://github.com/silverstripe/silverstripe-userforms/pull/1442
https://github.com/silverstripe/silverstripe-userforms/releases/tag/6.4.9
https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.0.7
https://github.com/silverstripe/silverstripe-userforms/releases/tag/7.1.1
https://github.com/silverstripe/silverstripe-userforms/security/advisories/GHSA-g8wr-r2v2-vqc6

Track CVE-2026-54721 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-65660Microsoft sharepoint server code injection vulnerabilityImproper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.KEVEPSS 2.1%9.8CVE-2026-60004Gitea diffpatch API code injection enables remote code executionGitea before 1.27.1 allows remote code execution through the diffpatch API by way of Git hook installation. The flaw is a code injection issue (CWE-9…KEVEPSS 24%analysed9.5CVE-2026-72530TrueConf Server sandbox breakout via crafted script code injectionTrueConf Server versions 5.3.X through 5.3.9, 5.4.X through 5.4.9, 5.5.X through 5.5.5 and earlier allow a remote unauthenticated attacker to break o…KEVEPSS 1.7%analysed9.4CVE-2025-62593Ray browser-based RCE via insufficient User-Agent guardRay, an AI compute engine, contains a critical remote code execution flaw before version 2.52.0. Its defense against browser-based attacks relies on …KEVEPSS 62%analysed9.8CVE-2026-9198Langflow auto_login and code validation chain enables unauthenticated RCEIBM Langflow OSS 1.0.0 through 1.10.0 exposes /api/v1/auto_login, which mints SUPERUSER tokens to any network caller, and /api/v1/validate/code, whic…KEVEPSS 29%analysed7.2CVE-2026-15410SonicWall SMA1000 AMC code injection allows OS command executionThe SMA1000 Appliance Management Console (AMC) contains a post-authentication code injection flaw (CWE-94) that, under specific conditions, lets an a…KEVEPSS 12%analysed9.8CVE-2008-4250Microsoft Windows Server service RPC path canonicalization buffer overflowThe Server service in multiple Windows versions fails to properly handle path canonicalization, allowing a crafted RPC request to overflow a buffer a…KEVEPSS 99%analysed8.8CVE-2026-34197Apache ActiveMQ Jolokia JMX bridge code injection via broker config URIApache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ with a default policy that allows exec operations on all org.apache.acti…KEVEPSS 15%analysed

Source: NIST National Vulnerability Database (record CVE-2026-54721), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.