CVE-2020-8091 Typo3 Cross-Site Scripting in Flash component (ELTS)

What is CVE-2020-8091?

CVE-2020-8091 is a medium-severity cross-site scripting vulnerability in Typo3 Typo3, published on 27 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

svg.swf in TYPO3 6.2.0 to 6.2.38 ELTS and 7.0.0 to 7.1.0 could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack on a targeted system. This may be at a contrib/websvg/svg.swf pathname.

Weakness: CWE-79

Which versions are affected by CVE-2020-8091?

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

Products include Typo3 Typo3.

How do I fix CVE-2020-8091?

Upgrade typo3/cms to a fixed version for your release line: 6.2.39 or 7.2.0.

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-2020-8091 being exploited?

There is no known exploitation of CVE-2020-8091 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 BIT-typo3-2020-8091, GHSA-qvhv-pwww-53jj.