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Vulnerability details: VCID-gqbq-47a9-7ygk
Vulnerability ID VCID-gqbq-47a9-7ygk
Aliases GHSA-5h5v-m596-r6rf
Summary 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)
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-502 Deserialization of Untrusted Data
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-5h5v-m596-r6rf
cvssv3.1 8.1 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-12-17-7.yaml
generic_textual HIGH https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-12-17-7.yaml
cvssv3.1 8.1 https://github.com/TYPO3-CMS/core
generic_textual HIGH https://github.com/TYPO3-CMS/core
cvssv3.1 8.1 https://typo3.org/security/advisory/typo3-psa-2019-011
generic_textual HIGH https://typo3.org/security/advisory/typo3-psa-2019-011
Reference id Reference type URL
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-12-17-7.yaml
https://github.com/TYPO3-CMS/core
https://typo3.org/security/advisory/typo3-psa-2019-011
GHSA-5h5v-m596-r6rf https://github.com/advisories/GHSA-5h5v-m596-r6rf
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/2019-12-17-7.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/TYPO3-CMS/core
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://typo3.org/security/advisory/typo3-psa-2019-011
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2025-07-01T12:11:39.858663+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/05/GHSA-5h5v-m596-r6rf/GHSA-5h5v-m596-r6rf.json 36.1.3