---
title: "Breaking: #83294 - Salted Passwords: Custom saltings must use the SaltInterface"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-83294"
source: "Changelog/9.0/Breaking-83294-SaltedPasswordsCustomSaltingsMustUseTheSaltInterface.rst"
modified: "2026-09-14T09:47:36+00:00"
---

# Breaking: #83294 - Salted Passwords: Custom saltings must use the SaltInterface

See [forge#83294](https://forge.typo3.org/issues/83294)

## Description

The salted passwords factory allowed to register custom saltings has been changed. All custom salts
need to implement `\TYPO3\CMS\SaltedPasswords\Salt\SaltInterface`. Before, this was
handled by extending from `\TYPO3\CMS\SaltedPasswords\Salt\AbstractSalt`, which has been renamed to
`\TYPO3\CMS\SaltedPasswords\Salt\AbstractComposedSalt` when the salting is implemented.

## Impact

When writing custom salts for TYPO3, they need to implement the SaltInterface.

If extending from `AbstractSalt`, custom salt now need to extend from `AbstractComposedSalt` and
implement the additional method `getSaltLength()` and `isValidSalt($salt)`.

## Affected Installations

TYPO3 installations using custom salts for `EXT:saltedpasswords`.

## Migration

Switch to the new implementation details mentioned above, and change your custom salt to fit
to the `SaltInterface` API.