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High, CVSS 8.0

Cross-Site Scripting through Fluid view helper arguments

CVE-2020-26216GHSA-hpjm-3ww5-6cpf

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (typo3fluid/fluid 2.6.10, 2.5.11, 2.4.4, 2.3.7, 2.2.4, 2.1.7, 2.0.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist typo3fluid/fluid

    Affected
    >= 2.0.0, < 2.0.8>= 2.1.0, < 2.1.7>= 2.2.0, < 2.2.4>= 2.3.0, < 2.3.7>= 2.4.0, < 2.4.4>= 2.5.0, < 2.5.11>= 2.6.0, < 2.6.10
    Fixed in
    2.2.4, 2.3.7, 2.5.11, 2.1.7, 2.0.8, 2.4.4, 2.6.10

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.0 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
EPSS
  • CVE-2020-26216: 1.04% estimated exploitation activity in the next 30 days; percentile 64.01 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Meta CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (5.7) CWE-79 Problem Three XSS vulnerabilities have been detected in Fluid: 1. TagBasedViewHelper allowed XSS throug 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. Solution 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. Updated versions of this package are bundled in following TYPO3 (typo3/cms-core) releases: TYPO3 v9.5.23 (using typo3fluid/fluid v2.6.10) TYPO3 v10.4.10 (using typo3fluid/fluid v2.6.10) The…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hpjm-3ww5-6cpf

Agent brief

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# Patch Next advisory brief: CVE-2020-26216

Advisory: Cross-Site Scripting through Fluid view helper arguments
IDs: CVE-2020-26216, GHSA-hpjm-3ww5-6cpf
Record: https://patchnext.com/advisories/cve-2020-26216 (revision 1, source checked 26 Oct 2026, 14:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: typo3fluid/fluid 2.6.10, 2.5.11, 2.4.4, 2.3.7, 2.2.4, 2.1.7, 2.0.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist typo3fluid/fluid: affected >= 2.0.0, < 2.0.8; >= 2.1.0, < 2.1.7; >= 2.2.0, < 2.2.4; >= 2.3.0, < 2.3.7; >= 2.4.0, < 2.4.4; >= 2.5.0, < 2.5.11; >= 2.6.0, < 2.6.10; fixed in 2.2.4, 2.3.7, 2.5.11, 2.1.7, 2.0.8, 2.4.4, 2.6.10

## Suggested inspection (read-only)
- Packagist typo3fluid/fluid: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on typo3fluid/fluid.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hpjm-3ww5-6cpf (GitHub-reviewed advisory GHSA-hpjm-3ww5-6cpf lists affected ranges: Packagist typo3fluid/fluid >=2.0.0 =2.1.0 =2.2.0 =2.3.0 =2.4.0 =2.5.0 =2.6.0 <2.6.10)

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