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CVE-2026-49740

TYPO3 CMS - Insecure Deserialization in Core API

MEDIUM
6.3
CVSS Score
Published: June 9, 2026 at 10:53 AM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendorTYPO3

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

TYPO3's cache frontend (VariableFrontend) and persistent key-value store (Registry) deserialized PHP payloads without integrity validation or class restrictions. An attacker with write access to the underlying storage backend (cache store or sys_registry database table) could inject a crafted serialized payload to trigger PHP Object Injection, potentially exploiting a gadget chain to achieve Remote Code Execution or other high-impact effects. Exploiting this vulnerability requires direct local write access to the storage, such as the SQL database or file system. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.51, 12.0.0-12.4.46, 13.0.0-13.4.31 and 14.0.0-14.3.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

TYPO3· TYPO3composer
95%
v < 10.4.5711.0.0 ≤ v < 11.5.5112.0.0 ≤ v < 12.4.4613.0.0 ≤ v < 13.4.3114.0.0 ≤ v < 14.3.311.0.012.0.013.0.014.0.0
Affected range stops below 10.4.57, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.5.51, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.4.46, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.4.31, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.3.3, so it looks safe — our inference, not a vendor statement

References (3)

Vendor Advisory
Source: cverecord
https://typo3.org/security/advisory/typo3-core-sa-2026-018
Patch
Source: cverecord
https://github.com/TYPO3/typo3/commit/48bcf24f31f52cc0b43d3bea4984634bd2cf85c7
Patch
Source: cverecord
https://github.com/TYPO3/typo3/commit/87cd7c5b710c44d3606fed277b040a75dc6a9c02

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMTYPO3
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-502

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