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Not in CISA KEV
HIGH severity

CVE-2019-19849 — cms-core

HIGH

CVE-2019-19849 is a high-severity (CVSS 8.8) Deserialization of Untrusted Data vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.

TYPO3 Insecure Deserialization in Query Generator & Query View

Also known asGHSA-rcgc-4xfc-564v
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.25%0.75%1.26%1.77%0.7%1.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

6 pkgs affected
🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms-core🐘typo3/cms🐘typo3/cms🐘typo3/cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in TYPO3 before 8.7.30, 9.x before 9.5.12, and 10.x before 10.2.2. It has been discovered that the classes QueryGenerator and QueryView are vulnerable to insecure deserialization. One exploitable scenario requires having the system extension ext:lowlevel (Backend Module: DB Check) installed, with a valid backend user who has administrator privileges. The other exploitable scenario requires having the system extension ext:sys_action installed, with a valid backend user who has limited privileges.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-core≥ 10.0.0&&< 10.2.110.2.1composer require typo3/cms-core:^10.2.1
🐘Packagisttypo3/cms-core≥ 8.0.0&&< 8.7.308.7.30composer require typo3/cms-core:^8.7.30
🐘Packagisttypo3/cms-core≥ 9.0.0&&< 9.5.129.5.12composer require typo3/cms-core:^9.5.12
🐘Packagisttypo3/cms≥ 10.0.0&&< 10.2.110.2.1composer require typo3/cms:^10.2.1
🐘Packagisttypo3/cms≥ 8.0.0&&< 8.7.308.7.30composer require typo3/cms:^8.7.30
🐘Packagisttypo3/cms≥ 9.0.0&&< 9.5.129.5.12composer require typo3/cms:^9.5.12

Affected Products

1 product · 3 configurations
Application
typo3typo3
≥ 10.0.0 && < 10.2.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for typo3/cms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update typo3/cms-core to 10.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-19849 is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

An issue was discovered in TYPO3 before 8.7.30, 9.x before 9.5.12, and 10.x before 10.2.2. It has been discovered that the classes QueryGenerator and QueryView are vulnerable to insecure deserialization. One exploitable scenario requires having the system extension ext:lowlevel (Backend Module: DB Check) installed, with a valid backend user who has administrator privileges. The other exploitable scenario requires having the system extension ext:sys_action installed, with a valid backend user who has limited privileges.
O3 Security · Impact-Aware SCA

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CVE-2019-19849: cms-core Deserialization — Fixed in 10.2.1