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Not in CISA KEV
HIGH severity

CVE-2020-26228 — cms-core

HIGH

CVE-2020-26228 is a high-severity (CVSS 7.5) CWE-312 vulnerability in typo3/cms-core. A fix is available for typo3/cms-core — see the affected versions and patch details below.

Cleartext storage of session identifier

Also known asBIT-typo3-2020-26228GHSA-954j-f27r-cj52
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs51th percentile — riskier than 51% of all scored CVEsHighest risk
0.00%0.39%0.78%1.18%0.2%0.7%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-26228 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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

User session identifiers were stored in cleartext - without processing of additional cryptographic hashing algorithms. This vulnerability cannot be exploited directly and occurs in combination with a chained attack - like for instance SQL injection in any other component of the system.

Solution

Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Credits

Thanks to TYPO3 security team member Helmut Hummel who reported this issue and to TYPO3 core & security team members Benni Mack & Oliver Hader as well as TYPO3 contributor Markus Klein who fixed the issue.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagisttypo3/cms-core≥ 9.0.0&&< 9.5.239.5.23composer require typo3/cms-core:^9.5.23
🐘Packagisttypo3/cms-core≥ 10.0.0&&< 10.4.1010.4.10composer require typo3/cms-core:^10.4.10
🐘Packagisttypo3/cms-core≥ 8.7.0&&< 8.7.388.7.38composer require typo3/cms-core:^8.7.38
🐘Packagisttypo3/cms≥ 10.0.0&&< 10.4.1010.4.10composer require typo3/cms:^10.4.10
🐘Packagisttypo3/cms≥ 9.0.0&&< 9.5.239.5.23composer require typo3/cms:^9.5.23
🐘Packagisttypo3/cms≥ 8.7.0&&< 8.7.388.7.38composer require typo3/cms:^8.7.38

Affected Products

1 product · 2 configurations
Application
typo3typo3
≥ 10.0.0 && < 10.4.10
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 9.5.23 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-26228 is resolved across your whole dependency graph.

  3. Workarounds

    Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.

Frequently Asked Questions

User session identifiers were stored in cleartext - without processing of additional cryptographic hashing algorithms. This vulnerability cannot be exploited directly and occurs in combination with a chained attack - like for instance SQL injection in any other component of the system. ### Solution Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described. ### Credits Thanks to TYPO3 security team member Helmut Hummel who reported this issue and to TYPO3 core & security team members Benni Mack & Oliver Hader as well as TYPO3 contributor Markus Klein who fixed the issue.
O3 Security · Impact-Aware SCA

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CVE-2020-26228: cms-core SQL Injection — Fixed in 9.5.23