CVE-2025-48203: Clickstorm/cs seo Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-6p8w-pc35-mqv8
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CVSS 5.5
CWE-79
Published
Advisory Summary

CVE-2025-48203 is a MODERATE (CVSS 5.5) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Clickstorm/cs seo libraries in the Packagist ecosystem. The issue involves [clickstorm] seo (cs_seo) typo3 extension cross-site scripting (xss) vulnerability. Remediation is available by upgrading affected packages to version 9.3.0, 8.4.0, 7.5.0, 6.8.0.

CVE-2025-48203 at a Glance

CVE Identifier CVE-2025-48203
GHSA Identifier GHSA-6p8w-pc35-mqv8
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Clickstorm/cs seo
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2025-48203

To remediate this vulnerability, upgrade all affected Clickstorm/cs seo dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

clickstorm/cs-seo fixed: 9.3.0 
Upgrade clickstorm/cs-seo to 9.3.0
clickstorm/cs-seo fixed: 8.4.0 
Upgrade clickstorm/cs-seo to 8.4.0
clickstorm/cs-seo fixed: 7.5.0 
Upgrade clickstorm/cs-seo to 7.5.0
clickstorm/cs-seo fixed: 6.8.0 
Upgrade clickstorm/cs-seo to 6.8.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for clickstorm/cs-seo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-48203, inspect your project dependencies for Clickstorm/cs seo:

inspect dependencies for clickstorm/cs-seo

Analyze the terminal output to locate any version of Clickstorm/cs seo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.3.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Clickstorm/cs seo, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2025-48203 Affected Clickstorm/cs seo Versions

4 component(s)
Fixed Versions:
9.3.08.4.07.5.06.8.0
Product / Package Ecosystem Affected Versions Fixed Version
clickstorm/cs-seo
 Packagist
≥ 9.0.0
< 9.3.0
9.3.0
clickstorm/cs-seo
 Packagist
≥ 8.0.0
< 8.4.0
8.4.0
clickstorm/cs-seo
 Packagist
≥ 7.0.0
< 7.5.0
7.5.0
clickstorm/cs-seo
 Packagist
≥ 6.3.0
< 6.8.0
6.8.0

References

NVD — CVE-2025-48203 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-48203
Security Fix Commit FIX COMMIT
https://github.com/clickstorm/cs_seo/commit/1cf6c40821102b1f1508fe4e76825569340c8f90
Clickstorm/cs seo Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/clickstorm/cs-seo/CVE-2025-48203.yaml
Clickstorm/cs seo Source Repository REPOSITORY
https://github.com/clickstorm/cs_seo
Clickstorm/cs seo Security Information SECURITY
https://typo3.org/security/advisory/typo3-ext-sa-2025-005

Frequently Asked Questions

What is CVE-2025-48203?
CVE-2025-48203 is a security vulnerability in Clickstorm/cs seo involving [clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Clickstorm/cs seo versions are affected?
Affected versions include releases prior to 9.3.0, 8.4.0, 7.5.0, 6.8.0 across affected packages: clickstorm/cs-seo.
What version fixes CVE-2025-48203?
Upgrading to 9.3.0, 8.4.0, 7.5.0, 6.8.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is clickstorm/cs-seo affected?
Yes, clickstorm/cs-seo is affected in releases prior to 9.3.0, 8.4.0, 7.5.0, 6.8.0. Upgrade your dependency to 9.3.0, 8.4.0, 7.5.0, 6.8.0 or later.
What is the CVSS score of CVE-2025-48203?
CVE-2025-48203 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C.
What CWE is associated with CVE-2025-48203?
CVE-2025-48203 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2025-48203?
Run the dependency tree command: 'inspect dependencies for clickstorm/cs-seo'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6p8w-pc35-mqv8",
  "modified" : "2025-05-21T19:05:00Z",
  "published" : "2025-05-21T17:18:16Z",
  "aliases" : [ "CVE-2025-48203" ],
  "summary" : "[clickstorm] SEO (cs_seo) TYPO3 extension Cross-site Scripting (XSS) vulnerability",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "clickstorm/cs-seo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.3.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "clickstorm/cs-seo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.4.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "clickstorm/cs-seo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.5.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "clickstorm/cs-seo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.3.0"
      }, {
        "fixed" : "6.8.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-48203"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/clickstorm/cs_seo/commit/1cf6c40821102b1f1508fe4e76825569340c8f90"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/clickstorm/cs-seo/CVE-2025-48203.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/clickstorm/cs_seo"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-ext-sa-2025-005"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-21T17:18:16Z",
    "nvd_published_at" : "2025-05-21T16:15:32Z"
  }
}