How severe is CVE-2026-47346?

No CVSS score has been assigned to CVE-2026-47346 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-47346?

CVE-2026-47346 affects the following packages: typo3/cms-core (Packagist), typo3/cms-core (Packagist), typo3/cms-core (Packagist), typo3/cms-core (Packagist), typo3/cms-core (Packagist), typo3/cms-form (Packagist), typo3/cms-form (Packagist), typo3/cms-form (Packagist), and 2 more. Ecosystems affected: Packagist.

How do I fix CVE-2026-47346?

Update typo3/cms-core to 10.4.57 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-47346 is resolved across your whole dependency graph.

How do I detect CVE-2026-47346 in my Packagist dependencies?

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

How do I mitigate CVE-2026-47346 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-47346 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-47346 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-47346?

CVE-2026-47346 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 36th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2026-47346 published, and has it been updated?

CVE-2026-47346 was published on June 9, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-47346 — typo3/cms-core

Fix: TYPO3/typo3@2030617

CVE-2026-47346 is a security vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.

TYPO3 CMS - Broken Access Control in Form Framework

Also known asGHSA-hwvq-2w67-rvxp

Published

Jun 9, 2026

Updated

Aug 12, 2026

Affected

10 pkgs

Patched

10 / 10

Exploits

None indexed

Exploitation data as of Sep 27, 2026 · OSV.dev, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
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-2026-47346.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs36th percentile — riskier than 36% of all scored CVEsHighest risk

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

Real-World Exposure

10 pkgs affected

🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-form🐘typo3/cms-form🐘typo3/cms-form+2 more

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

Problem

Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts.

Solution

Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described.

Credits

TYPO3 CMS thanks Alexander Künzl for reporting this issue, and to TYPO3 core & security team members Oliver Hader and Benjamin Franzke for fixing it.

Resources

TYPO3-CORE-SA-2026-008

Affected Packages

10 total 10 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`typo3/cms-core`	all versions	10.4.57`composer require typo3/cms-core:^10.4.57`
🐘Packagist	`typo3/cms-core`	≥ 11.0.0&&< 11.5.51	11.5.51`composer require typo3/cms-core:^11.5.51`
🐘Packagist	`typo3/cms-core`	≥ 12.0.0&&< 12.4.46	12.4.46`composer require typo3/cms-core:^12.4.46`
🐘Packagist	`typo3/cms-core`	≥ 13.0.0&&< 13.4.31	13.4.31`composer require typo3/cms-core:^13.4.31`
🐘Packagist	`typo3/cms-core`	≥ 14.0.0&&< 14.3.3	14.3.3`composer require typo3/cms-core:^14.3.3`
🐘Packagist	`typo3/cms-form`	all versions	10.4.57`composer require typo3/cms-form:^10.4.57`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update typo3/cms-core to 10.4.57 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-47346 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Problem Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., `.FORM.YAML`) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. ### Solution Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described. ### Credits TYPO3 CMS thanks Alexander Künzl for reporting this issue, and to TYPO3

O3 Security · Impact-Aware SCA

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