How severe is GHSA-8h28-f46f-m87h?

No CVSS score has been assigned to GHSA-8h28-f46f-m87h yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-8h28-f46f-m87h?

GHSA-8h28-f46f-m87h affects the following packages: typo3/cms (Packagist), typo3/cms (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-8h28-f46f-m87h?

Update typo3/cms to 8.7.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8h28-f46f-m87h is resolved across your whole dependency graph.

How do I detect GHSA-8h28-f46f-m87h in my Packagist dependencies?

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.

How do I mitigate GHSA-8h28-f46f-m87h if there is no patch (or I can't update yet)?

Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Is GHSA-8h28-f46f-m87h actively exploited in the wild?

No public exploit code has been indexed for GHSA-8h28-f46f-m87h 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.

When was GHSA-8h28-f46f-m87h published, and has it been updated?

GHSA-8h28-f46f-m87h was published on June 5, 2024 and was last updated on December 2, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

Insecure Deserialization in TYPO3 CMS

Real-World Exposure

2 pkgs affected

🐘typo3/cms🐘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

It has been discovered that the Form Framework (system extension "form") is vulnerable to Insecure Deserialization when being used with the additional PHP PECL package “yaml”, which is capable of unserializing YAML contents to PHP objects. A valid backend user account as well as having PHP setting "yaml.decode_php" enabled is needed to exploit this vulnerability (which is the default value according to PHP documentation).

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`typo3/cms`	≥ 8.5.0&&< 8.7.17	8.7.17`composer require typo3/cms:^8.7.17`
🐘Packagist	`typo3/cms`	≥ 9.0.0&&< 9.3.2	9.3.2`composer require typo3/cms:^9.3.2`

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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update typo3/cms to 8.7.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8h28-f46f-m87h is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

It has been discovered that the Form Framework (system extension "form") is vulnerable to Insecure Deserialization when being used with the additional PHP PECL package “yaml”, which is capable of unserializing YAML contents to PHP objects. A valid backend user account as well as having PHP setting "yaml.decode_php" enabled is needed to exploit this vulnerability (which is the default value according to PHP documentation).

O3 Security · Impact-Aware SCA

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Insecure Deserialization in TYPO3 CMSGHSA-8h28-f46f-m87h