CVE-2025-47593Network attack vector

Administrator-level stored XSS via unsanitized page HTML

Published May 7, 2025 · Updated Apr 28, 2026

Stored XSS in Really Simple Under Construction Page 1.4.6 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The Under Construction HTML setting insufficiently sanitizes and escapes saved markup, allowing script tags, event handlers, and javascript: URIs to persist and render. Administrator access and a victim viewing the injected page are required, with exposure limited to multisite installations or sites where unfiltered_html is disabled.

CVSS severity5.9
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Really Simple Under Construction Page 1.4.6 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The Under Construction HTML setting insufficiently sanitizes and escapes saved markup, allowing script tags, event handlers, and javascript: URIs to persist and render. Administrator access and a victim viewing the injected page are required, with exposure limited to multisite installations or sites where unfiltered_html is disabled.

The record

CVE
CVE-2025-47593
Published
May 7, 2025
Updated
Apr 28, 2026
Vendor
Jonas Hjalmarsson
Product
Really Simple Under Construction Page
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=0 <=1.4.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Jonas Hjalmarsson · Really Simple Under Construction Pageversion=0 <=1.4.6

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

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
Privilegesadmin
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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