CVE-2023-29528Public exploitNetwork attack vector

Code execution via invalid HTML comment sanitization

Published Apr 20, 2023 · Updated Feb 4, 2025

Cross-site scripting in XWiki Commons allows attackers to run JavaScript when a privileged user views crafted HTML cleaned in restricted mode. DefaultHTMLCleaner preserves malformed HTML comments, allowing parser confusion to expose attacker-supplied tags and event handlers that were treated as comment text. Affected releases begin with 4.2-milestone-1, and exploitation requires a privileged viewer; the script can execute server-side code with programming rights.

CVSS severity9.0
Critical
EPSS probability1.28%
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 XWiki Commons allows attackers to run JavaScript when a privileged user views crafted HTML cleaned in restricted mode. DefaultHTMLCleaner preserves malformed HTML comments, allowing parser confusion to expose attacker-supplied tags and event handlers that were treated as comment text. Affected releases begin with 4.2-milestone-1, and exploitation requires a privileged viewer; the script can execute server-side code with programming rights.

The record

CVE
CVE-2023-29528
Published
Apr 20, 2023
Updated
Feb 4, 2025
Vendor
CryptPad
Product
XWiki Commons
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=>= 4.2-milestone-1, < 14.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CryptPad · XWiki Commonsversion=>= 4.2-milestone-1, < 14.10

Published CVSS scores

9.0GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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 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 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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