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CVE-2025-48203

[clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability

6.4 MediumFix available

The cs_seo extension through 9.2.0 for TYPO3 allows XSS.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.25%Up 0.2 points since May 22, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.4

The cs_seo extension through 9.2.0 for TYPO3 allows XSS.

Record
CVE-2025-48203
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2025-16027 6.4

The cs_seo extension through 9.2.0 for TYPO3 allows XSS.

Record
EUVD-2025-16027
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-6p8w-pc35-mqv8 5.1

[clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability

Cross-site scripting (XSS) vulnerability in the [clickstorm] SEO (cs_seo) TYPO3 extension allows backend users to execute arbitrary script via the JSON-LD output.

Record
GHSA-6p8w-pc35-mqv8
CVSS 3.1
5.1 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C
Weakness
CWE-79
Updated
2026-11-02
NVD 6.4

The cs_seo extension through 9.2.0 for TYPO3 allows XSS.

Record
CVE-2025-48203
CVSS 3.1
6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-6p8w-pc35-mqv8 5.5

[clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability

Cross-site scripting (XSS) vulnerability in the [clickstorm] SEO (cs_seo) TYPO3 extension allows backend users to execute arbitrary script via the JSON-LD output.

Record
GHSA-6p8w-pc35-mqv8
CVSS 3.1
5.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C
Weakness
CWE-79
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
clickstorm/cs-seo
Packagist
 9.0.0 up to 9.3.0
9.3.0
clickstorm/cs-seo
Packagist
 8.0.0 up to 8.4.0
8.4.0
clickstorm/cs-seo
Packagist
 7.0.0 up to 7.5.0
7.5.0
clickstorm/cs-seo
Packagist
 6.3.0 up to 6.8.0
6.8.0
clickstorm/cs-seo
Packagist
 9.0.0 up to 9.3.0, plus listed versions
9.0.19.1.09.2.0
9.3.0
clickstorm/cs-seo
Packagist
 8.0.0 up to 8.4.0, plus listed versions
8.0.18.1.08.1.18.1.28.2.08.2.18.3.0
8.4.0
clickstorm/cs-seo
Packagist
 7.0.0 up to 7.5.0, plus listed versions
7.0.17.1.07.2.07.2.17.3.0
Show 4 moreShow less
7.3.17.3.27.3.37.4.0
7.5.0
clickstorm/cs-seo
Packagist
 6.3.0 up to 6.8.0, plus listed versions
6.3.16.3.26.4.06.4.16.5.06.6.06.7.0
6.8.0

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-48203 is a medium vulnerability (CVSS 6.4) in Typo3 Cs Seo Extension, published May 21, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. Fixed in clickstorm/cs-seo 9.3.0.

References

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