CVE-2011-4903 Typo3 XSS in RemoveXSS function

What is CVE-2011-4903?

CVE-2011-4903 is a medium-severity cross-site scripting vulnerability in Typo3 Typo3, published on 6 Nov 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Cross-site Scripting (XSS) in TYPO3 before 4.3.12, 4.4.x before 4.4.9, and 4.5.x before 4.5.4 allows remote attackers to inject arbitrary web script or HTML via the RemoveXSS function.

Weakness: CWE-79

Which versions are affected by CVE-2011-4903?

6 open source packages ship an affected version, including typo3/cms. It affects 1 product.

Products include Typo3 Typo3.

How do I fix CVE-2011-4903?

Upgrade typo3/cms to a fixed version for your release line: 4.3.12, 4.4.9 or 4.5.4.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2011-4903 being exploited?

There is no known exploitation of CVE-2011-4903 in the wild and no public exploit code.

Other vulnerabilities in Typo3 Typo3

• CVE-2009-0258 Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection Critical 10.0
• CVE-2011-3583 Typo3 SQL injection due to faulty prepared statements Critical 9.8
• CVE-2011-4628 Typo3 Authentication Bypass Critical 9.8
• CVE-2023-24814 Persisted Cross-Site Scripting in Frontend Rendering in typo3 High 8.8
• CVE-2021-41113 Cross-Site-Request-Forgery in Backend URI Handling in Typo3 High 8.8

All Typo3 Typo3 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q22w-r5qq-v3wf.