CVE-2020-15241: Cross-Site Scripting in TYPO3 Fluid Engine

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-10-08 · updated 2026-06-17
Weakness: CWE-601

Description

TYPO3 Fluid Engine (package `typo3fluid/fluid`) before versions 2.0.5, 2.1.4, 2.2.1, 2.3.5, 2.4.1, 2.5.5 or 2.6.1 is vulnerable to cross-site scripting when making use of the ternary conditional operator in templates like `{showFullName ? fullName : defaultValue}`. Updated versions of this package are bundled in following TYPO3 (`typo3/cms-core`) versions as well: TYPO3 v8.7.25 (using `typo3fluid/fluid` v2.5.4) and TYPO3 v9.5.6 (using `typo3fluid/fluid` v2.6.1).

Affected products

TYPO3 Fluid Engine: before 2.0.5; from 2.1.0 before 2.1.4; from 2.2.0 before 2.2.1; from 2.3.0 before 2.3.5; from 2.4.0 before 2.4.1; from 2.5.0 before 2.5.5 — fixed in 2.0.5, 2.1.4, 2.2.1, 2.3.5, 2.4.1, 2.5.5
typo3: 8.7.25, 9.5.6

How to fix

Upgrade to a fixed version: TYPO3 Fluid Engine 2.0.5, 2.1.4, 2.2.1, 2.3.5. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-15241 or the next vulnerability affects your stack