How severe is CVE-2022-24899?

CVE-2022-24899 has a CVSS score of 7.2/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-24899?

CVE-2022-24899 affects the following packages: contao/core-bundle (Packagist), contao/contao (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2022-24899?

Update contao/core-bundle to 4.13.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-24899 is resolved across your whole dependency graph.

How do I detect CVE-2022-24899 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for contao/core-bundle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2022-24899 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2022-24899 actively exploited in the wild?

No public exploit code has been indexed for CVE-2022-24899 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2022-24899?

CVE-2022-24899 has an EPSS (Exploit Prediction Scoring System) score of 4.5%, placing it in the 92th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2022-24899?

CVE-2022-24899 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Is there exploit tooling available for CVE-2022-24899?

A Nuclei detection template exists for CVE-2022-24899, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2022-24899 published, and has it been updated?

CVE-2022-24899 was published on May 5, 2022 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

CVE-2022-24899 — core-bundle

HIGHFix: contao/contao@1992068

CVE-2022-24899 is a high-severity (CVSS 7.2) Cross-site Scripting (XSS) vulnerability in contao/core-bundle. A fix is available for contao/core-bundle — see the affected versions and patch details below.

Cross site scripting via canonical tag

Also known asGHSA-m8x6-6r63-qvj2

Published

May 5, 2022

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2022-24899.

EPSS Exploitation Probability

via FIRST.org ↗

4.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

🐘contao/core-bundle🐘contao/contao

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Untrusted users can inject malicious code into the canonical tag, which is then executed on the web page (front end).

Patches

Update to Contao 4.13.3.

Workarounds

Disable canonical tags in the root page settings.

References

https://contao.org/en/security-advisories/cross-site-scripting-via-canonical-url

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`contao/core-bundle`	≥ 4.13.0&&< 4.13.3	4.13.3`composer require contao/core-bundle:^4.13.3`
🐘Packagist	`contao/contao`	≥ 4.13.0&&< 4.13.3	4.13.3`composer require contao/contao:^4.13.3`

Affected Products

1 product · 1 configurations

Application

contaocontao

≥ 4.13.0 && ≤ 4.13.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for contao/core-bundle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update contao/core-bundle to 4.13.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-24899 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

How to detect CVE-2022-24899

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2022-24899 -u https://target

Template: Contao <4.13.3 - Cross-Site Scripting
Severity: medium
Impact: Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in a victim's browser, leading to potential data theft, session hijacking, or defacement of the affected website.
Remediation: As a workaround, users may disable canonical tags in the root page settings.

Template by ProjectDiscovery nuclei-templates (ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

### Impact Untrusted users can inject malicious code into the canonical tag, which is then executed on the web page (front end). ### Patches Update to Contao 4.13.3. ### Workarounds Disable canonical tags in the root page settings. ### References https://contao.org/en/security-advisories/cross-site-scripting-via-canonical-url ### 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).