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Not in CISA KEV
MEDIUM severity

CVE-2023-28604 — fluid-components

MEDIUM

CVE-2023-28604 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in sitegeist/fluid-components. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for sitegeist/fluid-components — see the affected versions and patch details below.

Fluid Components TYPO3 extension vulnerable to Cross-Site Scripting

Also known asGHSA-8648-h559-8h42
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-28604.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk
0.01%0.45%0.89%1.33%0.8%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘sitegeist/fluid-components

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

All versions of Fluid Components before 3.5.0 were susceptible to Cross-Site Scripting. Version 3.5.0 of the extension fixes this issue. Due to the nature of the problem, some changes in your project's Fluid templates might be necessary to prevent unwanted double-escaping of HTML markup.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsitegeist/fluid-componentsall versions3.5.0composer require sitegeist/fluid-components:^3.5.0

Affected Products

1 product · 1 configurations
Application
fluid componentssitegeist
< 3.5.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The fluid_components (aka Fluid Components) extension before 3.5.0 for T…

github.comNVDDec 2023

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sitegeist/fluid-components, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sitegeist/fluid-components to 3.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-28604 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

All versions of Fluid Components before 3.5.0 were susceptible to Cross-Site Scripting. Version 3.5.0 of the extension fixes this issue. Due to the nature of the problem, some changes in your project's Fluid templates might be necessary to prevent unwanted double-escaping of HTML markup.
O3 Security · Impact-Aware SCA

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CVE-2023-28604: fluid-components XSS — Fixed in 3.5.0