How severe is CVE-2009-0816?

No CVSS score has been assigned to CVE-2009-0816 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2009-0816?

CVE-2009-0816 affects the following packages: typo3/cms (Packagist), typo3/cms (Packagist), typo3/cms (Packagist), typo3/cms (Packagist), typo3/cms (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2009-0816?

No patched version of typo3/cms has shipped for CVE-2009-0816 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect CVE-2009-0816 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2009-0816 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2009-0816?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2009-0816 can be triaged on real exposure rather than presence alone.

Is CVE-2009-0816 actively exploited in the wild?

No public exploit code has been indexed for CVE-2009-0816 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-2009-0816?

CVE-2009-0816 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 63th 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-2009-0816?

CVE-2009-0816 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.

When was CVE-2009-0816 published, and has it been updated?

CVE-2009-0816 was published on May 2, 2022 and was last updated on September 10, 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

CVE-2009-0816 — typo3/cms

CVE-2009-0816 is a Cross-site Scripting (XSS) vulnerability in typo3/cms. A fix is available for typo3/cms — see the affected versions and patch details below.

Typo3 Backend XSS Vulnerability

Published

May 2, 2022

Updated

Sep 10, 2026

Affected

5 pkgs

Patched

3 / 5

Exploits

None indexed

Exploitation data as of Sep 18, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs63th percentile — riskier than 63% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

5 pkgs affected

🐘typo3/cms🐘typo3/cms🐘typo3/cms🐘typo3/cms🐘typo3/cms

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

An Information Disclosure vulnerability in jumpUrl mechanism, used to track access on web pages and provided files, allows a remote attacker to read arbitrary files on a host.

The expected value of a mandatory hash secret, intended to invalidate such requests, is exposed to remote users allowing them to bypass access control by providing the correct value.

There's no authentication required to exploit this vulnerability. The vulnerability allows to read any file, the web server user account has access to.

Affected Packages

5 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`typo3/cms`	≥ 3.3.0	No fix
🐘Packagist	`typo3/cms`	≥ 4.0&&< 4.0.12	4.0.12`composer require typo3/cms:^4.0.12`
🐘Packagist	`typo3/cms`	≥ 4.1.0&&< 4.1.10	4.1.10`composer require typo3/cms:^4.1.10`
🐘Packagist	`typo3/cms`	≥ 4.2.0&&< 4.2.6	4.2.6`composer require typo3/cms:^4.2.6`
🐘Packagist	`typo3/cms`	all versions	No fix

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
No patched version of typo3/cms has shipped for CVE-2009-0816 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2009-0816 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2009-0816. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

An Information Disclosure vulnerability in jumpUrl mechanism, used to track access on web pages and provided files, allows a remote attacker to read arbitrary files on a host. The expected value of a mandatory hash secret, intended to invalidate such requests, is exposed to remote users allowing them to bypass access control by providing the correct value. There's no authentication required to exploit this vulnerability. The vulnerability allows to read any file, the web server user account has access to.

O3 Security · Impact-Aware SCA

Is CVE-2009-0816 in your dependencies?

O3 Security finds CVE-2009-0816 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works