CVE-2020-26216

Cross-Site Scripting in TYPO3 Fluid

MEDIUM

6.1

CVSS Score

Published: November 17, 2020 at 08:45 PM UTC

Updated: June 17, 2026 at 03:07 AM UTC

1 product affected across 1 vendorFluid

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Severity

MEDIUM6.1

Exploit prediction

EPSS 1%

Description

TYPO3 Fluid before versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 and 2.6.10 is vulnerable to Cross-Site Scripting. Three XSS vulnerabilities have been detected in Fluid: 1. TagBasedViewHelper allowed XSS through maliciously crafted additionalAttributes arrays by creating keys with attribute-closing quotes followed by HTML. When rendering such attributes, TagBuilder would not escape the keys. 2. ViewHelpers which used the CompileWithContentArgumentAndRenderStatic trait, and which declared escapeOutput = false, would receive the content argument in unescaped format. 3. Subclasses of AbstractConditionViewHelper would receive the then and else arguments in unescaped format. Update to versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 or 2.6.10 of this typo3fluid/fluid package that fix the problem described. More details are available in the linked advisory.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fluid · TYPO3

95%

v < 2.0.8v < 2.1.7v < 2.2.4v < 2.3.7v < 2.4.4v < 2.5.11v < 2.6.102.1.0 ≤ v < 2.1.72.2.0 ≤ v < 2.2.42.3.0 ≤ v < 2.3.72.4.0 ≤ v < 2.4.42.5.0 ≤ v < 2.5.112.6.0 ≤ v < 2.6.10

Affected range stops below 2.0.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.1.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.2.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.3.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.5.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.6.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/TYPO3/Fluid/commit/f20db4e74cf9803c6cffca2ed2f03e1b0b89d0dc

x_refsource_CONFIRMExploitThird Party Advisory

Source: [email protected]

https://github.com/TYPO3/Fluid/security/advisories/GHSA-hpjm-3ww5-6cpf

x_refsource_MISCExploitVendor Advisory

Source: [email protected]

https://typo3.org/security/advisory/typo3-core-sa-2020-009

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-79

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