GHSA-5h5v-m596-r6rf
TYPO3 Possible Insecure Deserialization in Extbase Request Handling
It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized.
However, since sensitive information could have been leaked by accident (e.g. in repositories or in commonly known and unprotected backup files), there is the possibility that attackers know the private encryptionKey and are able to calculate the required HMAC-SHA1 to allow a malicious payload to be deserialized.
Requirements for successfully exploiting this vulnerability (all of the following):
- rendering at least one Extbase plugin in the frontend
- encryptionKey has been leaked (from LocalConfiguration.php or corresponding .env file)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
What each source reports
GitHub Advisories Score used
TYPO3 Possible Insecure Deserialization in Extbase Request Handling
It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized.
However, since sensitive information could have been leaked by accident (e.g. in repositories or in commonly known and unprotected backup files), there is the possibility that attackers know the private encryptionKey and are able to calculate the required HMAC-SHA1 to allow a malicious payload to be deserialized.
Requirements for successfully exploiting this vulnerability (all of the following):
- rendering at least one Extbase plugin in the frontend
- encryptionKey has been leaked (from LocalConfiguration.php or corresponding .env file)
- Record
GHSA-5h5v-m596-r6rf- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
OSV
TYPO3 Possible Insecure Deserialization in Extbase Request Handling
It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized.
However, since sensitive information could have been leaked by accident (e.g. in repositories or in commonly known and unprotected backup files), there is the possibility that attackers know the private encryptionKey and are able to calculate the required HMAC-SHA1 to allow a malicious payload to be deserialized.
Requirements for successfully exploiting this vulnerability (all of the following):
- rendering at least one Extbase plugin in the frontend
- encryptionKey has been leaked (from LocalConfiguration.php or corresponding .env file)
- Record
GHSA-5h5v-m596-r6rf- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
typo3/cms-corePackagist | 8.0.0 up to 8.7.30 | 8.7.30 |
typo3/cms-corePackagist | 9.0.0 up to 9.5.12 | 9.5.12 |
typo3/cms-corePackagist | 8.0.0 up to 8.7.30, plus listed versions v8.7.10v8.7.11v8.7.12v8.7.13v8.7.14 Show 18 moreShow lessv8.7.15v8.7.16v8.7.17v8.7.18v8.7.19v8.7.20v8.7.21v8.7.22v8.7.23v8.7.24v8.7.25v8.7.26v8.7.27v8.7.28v8.7.29v8.7.7v8.7.8v8.7.9 | 8.7.30 |
typo3/cms-corePackagist | 9.0.0 up to 9.5.12, plus listed versions v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0 Show 16 moreShow lessv9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.2v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9 | 9.5.12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-5h5v-m596-r6rf is a high vulnerability (CVSS 8.1) in typo3/cms-core, published May 30, 2024. No source lists public exploit code. Fixed in typo3/cms-core 8.7.30.