What is CVE-2020-8091?

CVE-2020-8091 is a medium-severity vulnerability in TYPO3, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-27.

How severe is CVE-2020-8091?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2020-8091 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in TYPO3

CVE-2020-8091

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-01-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.052 (92.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.052 · newest: 0.052 · change: 0.000

Affected products

TYPO3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

typo3.org/security/advisory/typo3-psa-2019-003/ (Third Party Advisory)
www.purplemet.com/blog/typo3-xss-vulnerability (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8091?: CVE-2020-8091 is a medium-severity vulnerability in TYPO3, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-27.
How severe is CVE-2020-8091?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-8091 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.