CVE-2023-47125Public exploitNetwork attack vector

Cross-site scripting via unencoded processing instructions

Published Nov 14, 2023 · Updated Aug 29, 2024

Cross-site scripting in TYPO3 HTML Sanitizer 1.0.0 through 1.5.2 and 2.0.0 through 2.1.3 allows remote attackers to execute script. CommonVisitor failed to classify DOMProcessingInstruction nodes as invalid, so a crafted XML processing instruction survived sanitization and was reparsed by browsers as executable markup. Exploitation requires attacker-controlled HTML to pass through the component and a user to render the sanitized output; the demonstrated consequence is script execution in that user's browser.

CVSS severity4.7
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in TYPO3 HTML Sanitizer 1.0.0 through 1.5.2 and 2.0.0 through 2.1.3 allows remote attackers to execute script. CommonVisitor failed to classify DOMProcessingInstruction nodes as invalid, so a crafted XML processing instruction survived sanitization and was reparsed by browsers as executable markup. Exploitation requires attacker-controlled HTML to pass through the component and a user to render the sanitized output; the demonstrated consequence is script execution in that user's browser.

The record

CVE
CVE-2023-47125
Published
Nov 14, 2023
Updated
Aug 29, 2024
Vendor
TYPO3 Association
Product
TYPO3 HTML Sanitizer
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 1.0.0, < 1.5.3
  2. Affected versionversion=>= 2.0.0, < 2.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TYPO3 Association · TYPO3 HTML Sanitizerversion=>= 1.0.0, < 1.5.3; version=>= 2.0.0, < 2.1.4

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.4TYPO3 AssociationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
4.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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