CVE-2025-48203Network attack vector

Authenticated script execution via unencoded JSON-LD output

Published May 21, 2025 · Updated May 21, 2025

Cross-site scripting in [clickstorm] SEO allows remote authenticated users to execute scripts through crafted JSON-LD content. StructuredData::wrapWithLd inserts stored json_ld metadata directly between script tags without encoding characters that can terminate the element. A logged-in TYPO3 backend user must supply the content; the script runs when the affected output is rendered, enabling actions in the viewer's browser context.

CVSS severity6.4
Medium
EPSS probability0.23%
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 [clickstorm] SEO allows remote authenticated users to execute scripts through crafted JSON-LD content. StructuredData::wrapWithLd inserts stored json_ld metadata directly between script tags without encoding characters that can terminate the element. A logged-in TYPO3 backend user must supply the content; the script runs when the affected output is rendered, enabling actions in the viewer's browser context.

The record

CVE
CVE-2025-48203
Published
May 21, 2025
Updated
May 21, 2025
Vendor
clickstorm GmbH
Product
[clickstorm] SEO (cs_seo)
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2025CVE publishedPublication date reported by the CVE source.
  2. May 21, 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=6.3.0 <6.8.0
  2. Affected versionversion=7.0.0 <7.5.0
  3. Affected versionversion=8.0.0 <8.4.0
  4. Affected versionversion=9.0.0 <9.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

clickstorm GmbH · [clickstorm] SEO (cs_seo)version=6.3.0 <6.8.0; version=7.0.0 <7.5.0; version=8.0.0 <8.4.0; version=9.0.0 <9.3.0

Published CVSS scores

6.4MITRECVSS: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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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