How severe is CVE-2008-5656?

No CVSS score has been assigned to CVE-2008-5656 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2008-5656?

CVE-2008-5656 affects the following packages: typo3/cms-felogin (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2008-5656?

Update typo3/cms-felogin to 4.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2008-5656 is resolved across your whole dependency graph.

How do I detect CVE-2008-5656 in my Packagist dependencies?

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

How do I mitigate CVE-2008-5656 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-2008-5656 actively exploited in the wild?

No public exploit code has been indexed for CVE-2008-5656 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-2008-5656?

CVE-2008-5656 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 64th 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-2008-5656?

CVE-2008-5656 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-2008-5656 published, and has it been updated?

CVE-2008-5656 was published on May 17, 2022 and was last updated on April 9, 2025. 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-2008-5656 — cms-felogin

CVE-2008-5656 is a Cross-site Scripting (XSS) vulnerability in typo3/cms-felogin. A fix is available for typo3/cms-felogin — see the affected versions and patch details below.

typo3/cms-felogin Cross-site Scripting vulnerability

Published

May 17, 2022

Updated

Apr 9, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 31, 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 CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk

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

Real-World Exposure

1 pkg affected

🐘typo3/cms-felogin

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

Cross-site scripting (XSS) vulnerability in the frontend plugin for the felogin system extension in TYPO3 4.2.0, 4.2.1 and 4.2.2 allows remote attackers to inject arbitrary web script or HTML via unknown vectors.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`typo3/cms-felogin`	≥ 4.2.0&&< 4.2.3	4.2.3`composer require typo3/cms-felogin:^4.2.3`

Affected Products

1 product · 3 configurations

Application

typo3typo3

3 versions

4.2.04.2.14.2.2

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-felogin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update typo3/cms-felogin to 4.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2008-5656 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.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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