CVE-2025-53693Public exploitNetwork attack vector

Unauthenticated HTML cache poisoning via reflected AddToCache

Published Sep 3, 2025 · Updated Sep 3, 2025

Unsafe reflection in Sitecore XM and XP 9.0 through 9.3 and 10.0 through 10.4 allows remote attackers to poison HTML caches. The pre-auth XAML handler lets crafted __PARAMETERS and __SOURCE values reflectively invoke WebControl.AddToCache, which passes an attacker-chosen key and HTML to HtmlCache.SetHtml. No account is required, but a usable cache key must be guessed or enumerated; success overwrites cached page content and can serve arbitrary HTML or JavaScript to visitors.

CVSS severity9.8
Critical
EPSS probability14.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe reflection in Sitecore XM and XP 9.0 through 9.3 and 10.0 through 10.4 allows remote attackers to poison HTML caches. The pre-auth XAML handler lets crafted __PARAMETERS and __SOURCE values reflectively invoke WebControl.AddToCache, which passes an attacker-chosen key and HTML to HtmlCache.SetHtml. No account is required, but a usable cache key must be guessed or enumerated; success overwrites cached page content and can serve arbitrary HTML or JavaScript to visitors.

The record

CVE
CVE-2025-53693
Published
Sep 3, 2025
Updated
Sep 3, 2025
Vendor
Sitecore
Product
Sitecore Experience Manager
Classifications
CWE-470, CAPEC-138, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=10.0 <=10.4
  2. Affected versionversion=9.0 <=9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sitecore · Sitecore Experience Managerversion=10.0 <=10.4; version=9.0 <=9.3
Sitecore · Sitecore Experience Platformversion=10.0 <=10.4; version=9.0 <=9.3

Published CVSS scores

9.8WizCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CAPEC-138Reflection Injection
T1190Exploit Public-Facing Application

Public exploit references

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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