CVE-2025-30148Network attack vector

Stored XSS via backspace-bypassed URL sanitization

Published Apr 10, 2025 · Updated Apr 10, 2025

Stored cross-site scripting in Silverstripe Framework before 5.3.23 allows remote authenticated users to inject JavaScript into site content. XssSanitiser's attribute-content regex treats whitespace but not backspace characters around JavaScript URLs, so crafted href, src, or data attributes survive server-side filtering. CMS content-editing access is required, and later front-end rendering executes the stored script in a visitor's browser.

CVSS severity5.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Silverstripe Framework before 5.3.23 allows remote authenticated users to inject JavaScript into site content. XssSanitiser's attribute-content regex treats whitespace but not backspace characters around JavaScript URLs, so crafted href, src, or data attributes survive server-side filtering. CMS content-editing access is required, and later front-end rendering executes the stored script in a visitor's browser.

The record

CVE
CVE-2025-30148
Published
Apr 10, 2025
Updated
Apr 10, 2025
Vendor
Silverstripe
Product
Silverstripe Framework
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2025Record 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=< 5.3.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Silverstripe · Silverstripe Frameworkversion=< 5.3.23

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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