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Not in CISA KEV
MEDIUM severity

CVE-2018-6905 — cms

MEDIUMFix: TYPO3/typo3@d2c0ea7

CVE-2018-6905 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in typo3/cms. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for typo3/cms — see the affected versions and patch details below.

Typo3 XSS Vulnerability

Also known asGHSA-3w22-wrwx-2r75
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
3 known
Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
1.67%2.05%2.42%2.80%2.3%2.2%Apr 26Aug 26Oct 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
🐘typo3/cms

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

The page module in TYPO3 before 8.7.11, and 9.1.0, has XSS via $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'], as demonstrated by an admin entering a crafted site name during the installation process.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cmsall versions9.2.0composer require typo3/cms:^9.2.0

Affected Products

1 product · 2 configurations
Application
typo3typo3
≥ 9.0.0 && < 9.1.0
range
Exploits & PoCs
3

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

The page module in TYPO3 before 8.7.11, and 9.1.0, has XSS via $GLOBALS[…

github.comNVDMay 2018

Report on github.com

github.comGithubApr 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update typo3/cms to 9.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-6905 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

The page module in TYPO3 before 8.7.11, and 9.1.0, has XSS via $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'], as demonstrated by an admin entering a crafted site name during the installation process.
O3 Security · Impact-Aware SCA

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CVE-2018-6905: cms XSS — Fixed in 9.2.0