CVE-2024-45612: Insert tag injection via canonical URL in Contao

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-17 · updated 2026-06-17
Weakness: CWE-20

Description

Contao is an Open Source CMS. In affected versions an untrusted user can inject insert tags into the canonical tag, which are then replaced on the web page (front end). Users are advised to update to Contao 4.13.49, 5.3.15 or 5.4.3. Users unable to upgrade should disable canonical tags in the root page settings.

Affected products

contao: from 4.13.0 before 4.13.49; from 5.3.0 before 5.3.15; from 5.4.0 before 5.4.3 — fixed in 4.13.49, 5.3.15, 5.4.3

How to fix

Upgrade to a fixed version: contao 4.13.49, 5.3.15, 5.4.3. Check the vendor advisory for mitigations.

References

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