Home/CVE/TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that
CVE

CVE-2021-41114

TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that

TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that TYPO3 CMS is susceptible to host spoofing due to improper validation of the HTTP Host header. TYPO3 uses the HTTP Host header, for example, to generate absolute URLs during the frontend rendering process.

Since the host header itself is provided by the client, it can be forged to any value, even in a name-based virtual hosts environment. This vulnerability is the same as described in TYPO3-CORE-SA-2014-001 (CVE-2014-3941). A regression, introduced during TYPO3 v11 development, led to this situation.

The already existing setting $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] (used as an effective mitigation strategy in previous TYPO3 versions) was not evaluated anymore, and reintroduced the vulnerability.

MEDIUM · CVSS 4.8 EPSS 0.00289
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax
▤

Affected Products & Versions

1
typo3>= 11.0.0 and < 11.5.0
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Packagist typo3/cms MEDIUM fixed in 11.5.0
Packagist typo3/cms-core MEDIUM fixed in 11.5.0
▣

Scoring & Timeline

4.8
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Oct 2021 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4PatchThird Party Advisory
https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphmThird Party Advisory
https://typo3.org/security/advisory/typo3-core-sa-2021-015Vendor Advisory
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