Typo3 XSS Vulnerability

published 2018-04-08 8 y ago modified 2026-06-17 4 mo ago also GHSA-3w22-wrwx-2r75 , EUVD-2022-2249

cvss: 4.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.2%; EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 2

packagist typo3/cms 9.2.0
typo3 typo3 8.7.11, 9.1.0

github.com/TYPO3/typo3@d2c0ea7 commit
forge.typo3.org/issues/84191 advisory

Exploit prediction

2.17% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/pradeepjairamani/TYPO3-XSS-POC referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	4.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub	3.0	4.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	typo3/cms	<9.2.0	9.2.0

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

forge.typo3.org /issues/84191
web, patch, vendor-advisory
github.com /TYPO3/typo3/commit/d2c0ea7db3b31a796a82f9d39f77f9983beb7c35
web
github.com /pradeepjairamani/TYPO3-XSS-POC
web, exploit, third-party-advisory
securitytracker.com /id/1040755
vdb-entry, web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2018-6905
advisory

Sources

CVE List CVE-2018-6905
GitHub Advisory GHSA-3w22-wrwx-2r75
NVD CVE-2018-6905

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary