CVE-2025-29790: Contao/core bundle Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-vqqr-fgmh-f626
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CWE-79
Published
Advisory Summary

CVE-2025-29790 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Contao/core bundle libraries in the Packagist ecosystem. The issue involves contao vulnerable to cross-site scripting (xss) through svg uploads. Remediation is available by upgrading affected packages to version 4.13.54, 5.3.30, 5.5.6.

CVE-2025-29790 at a Glance

CVE Identifier CVE-2025-29790
GHSA Identifier GHSA-vqqr-fgmh-f626
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Contao/core bundle
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-29790

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

contao/core-bundle fixed: 4.13.54 
Upgrade contao/core-bundle to 4.13.54
contao/core-bundle fixed: 5.3.30 
Upgrade contao/core-bundle to 5.3.30
contao/core-bundle fixed: 5.5.6 
Upgrade contao/core-bundle to 5.5.6
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 contao/core-bundle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-29790, inspect your project dependencies for Contao/core bundle:

inspect dependencies for contao/core-bundle

Analyze the terminal output to locate any version of Contao/core bundle in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.13.54), 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 Contao/core bundle, 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

### Impact Users can upload SVG files with malicious code, which is then executed in the back end and/or front end. ### Patches Update to Contao 4.13.54, 5.3.30 or 5.5.6. ### Workarounds Remove `svg,svgz` from the allowed upload file types in the system settings and from `contao.editable_files` in the `config.yaml`. ### References https://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads ### For more information If you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).

CVE-2025-29790 Affected Contao/core bundle Versions

3 component(s)
Fixed Versions:
4.13.545.3.305.5.6
Product / Package Ecosystem Affected Versions Fixed Version
contao/core-bundle
 Packagist
≥ 4.0.0
< 4.13.54
4.13.54
contao/core-bundle
 Packagist
≥ 5.3.0
< 5.3.30
5.3.30
contao/core-bundle
 Packagist
≥ 5.4.0
< 5.5.6
5.5.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/contao/contao/security/advisories/GHSA-vqqr-fgmh-f626
NVD — CVE-2025-29790 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-29790
Contao/core bundle Security Information SECURITY
https://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads
Contao/core bundle Source Repository REPOSITORY
https://github.com/contao/contao

Frequently Asked Questions

What is CVE-2025-29790?
CVE-2025-29790 is a security vulnerability in Contao/core bundle involving Contao Vulnerable to Cross-Site Scripting (XSS) through SVG uploads under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Contao/core bundle versions are affected?
Affected versions include releases prior to 4.13.54, 5.3.30, 5.5.6 across affected packages: contao/core-bundle.
What version fixes CVE-2025-29790?
Upgrading to 4.13.54, 5.3.30, 5.5.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is contao/core-bundle affected?
Yes, contao/core-bundle is affected in releases prior to 4.13.54, 5.3.30, 5.5.6. Upgrade your dependency to 4.13.54, 5.3.30, 5.5.6 or later.
What CWE is associated with CVE-2025-29790?
CVE-2025-29790 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-2025-29790?
Run the dependency tree command: 'inspect dependencies for contao/core-bundle'. 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-vqqr-fgmh-f626",
  "modified" : "2025-04-17T12:44:08Z",
  "published" : "2025-03-18T21:07:17Z",
  "aliases" : [ "CVE-2025-29790" ],
  "summary" : "Contao Vulnerable to Cross-Site Scripting (XSS) through SVG uploads",
  "details" : "### Impact\n\nUsers can upload SVG files with malicious code, which is then executed in the back end and/or front end.\n\n### Patches\n\nUpdate to Contao 4.13.54, 5.3.30 or 5.5.6.\n\n### Workarounds\n\nRemove `svg,svgz` from the allowed upload file types in the system settings and from `contao.editable_files` in the `config.yaml`.\n\n### References\n\nhttps://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads\n\n### For more information\n\nIf you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/core-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.13.54"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/core-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.3.0"
      }, {
        "fixed" : "5.3.30"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/core-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.4.0"
      }, {
        "fixed" : "5.5.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/security/advisories/GHSA-vqqr-fgmh-f626"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-29790"
  }, {
    "type" : "WEB",
    "url" : "https://contao.org/en/security-advisories/cross-site-scripting-through-svg-uploads"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/contao/contao"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-18T21:07:17Z",
    "nvd_published_at" : "2025-03-18T19:15:50Z"
  }
}