CVE-2022-24899
Published: 06 May 2022
Summary
CVE-2022-24899 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Contao Contao. Its CVSS base score is 7.2 (High).
Operationally, ranked in the top 2.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Contao, an open source content management system, is affected by a cross-site scripting vulnerability in versions prior to 4.13.3. The flaw permits injection of arbitrary code into the canonical tag, which is categorized under CWE-79 and carries a CVSS 3.1 score of 7.2 reflecting network attack vector, low complexity, no required privileges or user interaction, and changed scope with limited confidentiality and integrity impact.
An unauthenticated remote attacker can supply a crafted canonical URL that is rendered by the application, enabling execution of attacker-controlled script in the context of other users' browsers. Successful exploitation can lead to theft of session tokens, manipulation of page content, or other client-side actions without needing access to administrative interfaces.
Official advisories from Contao recommend disabling canonical tags via root page settings as an immediate workaround and point to patches released in version 4.13.3, with the fix documented in the referenced GitHub commit and security advisory.
The EPSS score for this CVE rose from lower values to a peak of 0.5950 on 2025-12-11 before receding to the current 0.4706, indicating a period of increased exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-4528
Vulnerability details
Contao is a powerful open source CMS that allows you to create professional websites and scalable web applications. In versions of Contao prior to 4.13.3 it is possible to inject code into the canonical tag. As a workaround users may…
more
disable canonical tags in the root page settings.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.