CVE-2023-0230Public exploitNetwork attack vector

Stored XSS via unescaped CTA block class attributes

Published Feb 27, 2023 · Updated Mar 10, 2025

Stored XSS in VK All in One Expansion Unit before 9.86.0.0 allows remote authenticated users to inject scripts through CTA blocks. The CTA block renders its user-controlled Additional CSS class value into an HTML attribute without validation or output escaping. Contributor access, an enabled CTA Expansion feature, and a published CTA are required; the supplied proof of concept executes when a visitor opens the post and moves the pointer over the block.

CVSS severity5.4
Medium
EPSS probability0.56%
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 VK All in One Expansion Unit before 9.86.0.0 allows remote authenticated users to inject scripts through CTA blocks. The CTA block renders its user-controlled Additional CSS class value into an HTML attribute without validation or output escaping. Contributor access, an enabled CTA Expansion feature, and a published CTA are required; the supplied proof of concept executes when a visitor opens the post and moves the pointer over the block.

The record

CVE
CVE-2023-0230
Published
Feb 27, 2023
Updated
Mar 10, 2025
Vendor
Vektor,Inc.
Product
VK All in One Expansion Unit
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=0 <9.86.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vektor,Inc. · VK All in One Expansion Unitversion=0 <9.86.0.0

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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