CVE-2023-30537Public exploitNetwork attack vector

Authenticated code execution via unescaped theme styles

Published Apr 16, 2023 · Updated Feb 6, 2025

Code injection in XWiki Platform allows remote authenticated users to execute arbitrary Groovy, Python, or Velocity code. FlamingoThemesCode.WebHomeSheet renders attacker-controlled Theme Class style values inside an HTML block without escaping them, allowing script macros to break out of the intended context. Exploitation requires permission to add an object to a page, and the default-installed page grants successful attackers full access to the XWiki installation.

CVSS severity9.9
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in XWiki Platform allows remote authenticated users to execute arbitrary Groovy, Python, or Velocity code. FlamingoThemesCode.WebHomeSheet renders attacker-controlled Theme Class style values inside an HTML block without escaping them, allowing script macros to break out of the intended context. Exploitation requires permission to add an object to a page, and the default-installed page grants successful attackers full access to the XWiki installation.

The record

CVE
CVE-2023-30537
Published
Apr 16, 2023
Updated
Feb 6, 2025
Vendor
CryptPad
Product
XWiki Platform
Classifications
CWE-95, CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2025Record 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=>= 12.6.6, < 13.10.11
  2. Affected versionversion=>= 14.0-rc-1, < 14.4.7
  3. Affected versionversion=>= 14.5, < 14.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CryptPad · XWiki Platformversion=>= 12.6.6, < 13.10.11; version=>= 14.0-rc-1, < 14.4.7; version=>= 14.5, < 14.10

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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