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🛡️ CVE-2026-6553 — typo3

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-312 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

TYPO3 CMS Stores Cleartext Password in User Settings Module

Problem

The backend user settings module (SetupModuleController) incorrectly conflates entity data (like passwords or email address) with user-interface settings (like theme, display options) when persisting changes. As a result, passwords were stored in cleartext in the uc and user_settings fields of the be_users database table.

The cleartext data was only persisted if users changed their credentials in the backend user settings module when the TYPO3 14.2.0 release was used (not in any other version).

Solution

Update to TYPO3 version 14.3.0 LTS which fixes the problem described.

> [!IMPORTANT]

> Manual actions required

>

> Updating to the patched release does not retroactively clean existing data. It is recommended to execute all User Settings upgrade wizards in the TYPO3 Install Tool, including the dedicated User Settings Scrubbing wizard, which sanitizes the incorrectly persisted cleartext values from the uc and user_settings fields of the be_users table. Additionally, affected backend user accounts should be assigned new passwords.

>

> _Admin Tools → Upgrade → Upgrade Wizard → User Settings Scrubbing_

Credits

TYPO3 thanks Martin Clewing for reporting this issue, and TYPO3 core team members Oliver Hader, Stefan Bürk and Garvin Hicking for fixing it.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, 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 none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-6553 is classified as CWE-312: Cleartext Storage of Sensitive Information. Sensitive values are written to storage unencrypted and readable by anyone with access to it.

Affected software

CVE-2026-6553 is recorded against 2 packages.

  • typo3
  • typo3/cms-backend (from 14.2.0 up to 14.3.0)

Timeline and source

Published on 21 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
typo3.org

Other advisories for this package

typo3 has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-312: Cleartext Storage of Sensitive Information) in other software:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-312
Public Exploit ✅ No
Source NVD
Published 2026-04-21
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
typo3 — —
typo3/cms-backend 14.2.0 14.3.0

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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