🛡️ GHSA-hh95-5xm5-v8v7 — cms

🟠 CVSS 8.0 — High ✅ No Known Exploit OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TYPO3 CMS 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)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

GHSA-hh95-5xm5-v8v7 is recorded against 1 package.

  • typo3/cms (from 9.0.0 up to 9.5.12)

Timeline and source

Published on 7 June 2024 and last revised on 4 December 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
typo3.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-06-07
Updated 2026-08-20
Modified 2024-12-04
Fix URL N/A

Affected Packages

Software From version Fixed in
typo3/cms 9.0.0 9.5.12

Similar Threats

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