CVE-2026-54721Network attack vector

Authenticated code execution via translation-block interpolation

Published Aug 27, 2026 · Updated Aug 27, 2026

Code injection in Silverstripe UserForms 6.4.8 and earlier, 7.0.0 through 7.0.6, and 7.1.0 allows remote authenticated users to execute PHP code. The template engine compiles the translation block's default and context strings into double-quoted PHP literals, causing injected variable-variable expressions to be interpolated and evaluated. Exploitation requires CMS access with permission to configure a UserForms email recipient and grants code execution in the server process, exposing application data and service availability.

CVSS severity8.8
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Silverstripe UserForms 6.4.8 and earlier, 7.0.0 through 7.0.6, and 7.1.0 allows remote authenticated users to execute PHP code. The template engine compiles the translation block's default and context strings into double-quoted PHP literals, causing injected variable-variable expressions to be interpolated and evaluated. Exploitation requires CMS access with permission to configure a UserForms email recipient and grants code execution in the server process, exposing application data and service availability.

The record

CVE
CVE-2026-54721
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Silverstripe
Product
UserForms
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.4.9
  2. Affected versionversion=>= 7.0.0, < 7.0.7
  3. Affected versionversion=>= 7.1.0, < 7.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Silverstripe · UserFormsversion=< 6.4.9; version=>= 7.0.0, < 7.0.7; version=>= 7.1.0, < 7.1.1

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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