TYPO3 CMS has Insecure Deserialization via Core API

CVE-2026-49740 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Problem

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.

Solution

Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described.

Credits

TYPO3 CMS thanks “z3rco”, Chowdhury Faizal Ahammed, Rick Larabee, Vitaly Simonovich, Nozomu Sasaki, Mert Akdag, “tikket”, Shafi Almutairi for reporting this issue, and to TYPO3 core & security team member Oliver Hader for fixing it.

Resources

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-06-12 19:09:26 UTC
Updated
2026-06-12 19:09:29 UTC
GitHub reviewed
2026-06-12 19:09:26 UTC
NVD published
2026-06-09

EPSS Score

Score Percentile
0.25% 48.13%

CVSS Scores

Base score Version Severity Vector
6.3 4.0 —
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H Click to expand
Attack vector (AV:L)
Attacker needs local access on the target system.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:L)
Low privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:L)
Limited integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:H)
High confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:H)
High integrity impact on subsequent systems.
Subsequent system availability impact (SA:H)
High availability impact on subsequent systems.

Identifiers

Type Value
GHSA GHSA-c78m-c52x-jgwp ↗
CVE CVE-2026-49740 ↗

CWEs

CWE id Name
CWE-502 Deserialization of Untrusted Data

Affected packages (5)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
composer typo3/cms-core < 10.4.57 10.4.57 —
composer typo3/cms-core >= 11.0.0, < 11.5.51 11.5.51 —
composer typo3/cms-core >= 12.0.0, < 12.4.46 12.4.46 —
composer typo3/cms-core >= 13.0.0, < 13.4.31 13.4.31 —
composer typo3/cms-core >= 14.0.0, < 14.3.3 14.3.3 —

References

cvelogic Threat Intelligence