CVE-2023-6303Public exploitNetwork attack vector

Stored script execution via unfiltered meta tags

Published Nov 27, 2023 · Updated Aug 2, 2024

Stored cross-site scripting in CSZ CMS 1.3.0 allows remote authenticated users to execute script in visitors' browsers via Additional Meta Tag. The Site Settings handler saves Additional Meta Tag content without strict filtering, and the homepage emits the stored SVG markup into its response. Administrator privileges are required to plant the payload, and execution occurs when a visitor loads the homepage, allowing modification of content shown in that browser.

CVSS severity4.8
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in CSZ CMS 1.3.0 allows remote authenticated users to execute script in visitors' browsers via Additional Meta Tag. The Site Settings handler saves Additional Meta Tag content without strict filtering, and the homepage emits the stored SVG markup into its response. Administrator privileges are required to plant the payload, and execution occurs when a visitor loads the homepage, allowing modification of content shown in that browser.

The record

CVE
CVE-2023-6303
Published
Nov 27, 2023
Updated
Aug 2, 2024
Vendor
CSZ CMS
Product
CSZ CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

CSZ CMS · CSZ CMSversion=1.3.0

Published CVSS scores

2.4VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.3VulDBAV:N/AC:L/Au:M/C:N/I:P/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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