ZITADEL has LDAP Filter Injection in Login Flow

CVE-2026-44671 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Summary

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.

Impact

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.

Note that an authentication bypass is not possible.

Affected Versions

Systems integrating LDAP as IdPs and running one of the following versions are affected:

  • 4.x: 4.0.0 through 4.14.0 (including RC versions)
  • 3.x: 3.1.0 through 3.4.9
  • 2.x: 2.71.11 through 2.71.19

Patches

The vulnerability has been addressed in the latest releases. The patch resolves the issue by requiring the correct permission in case the verification flag is provided and only allows self-management of the email address, resp. phone number itself.

Workarounds

The recommended solution is to upgrade to a patched version. If an immediate upgrade is not possible, developers should ensure their project's LDAP directory has strict access controls to limit the scope of information disclosure.

Questions

If there are any questions or comments about this advisory, please send an email to [email protected]

Credits

This vulnerability was identified and reported by ProScan AppSec (https://proscan.one/).

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-05-08 17:11:29 UTC
Updated
2026-05-15 23:47:19 UTC
GitHub reviewed
2026-05-08 17:11:29 UTC
NVD published
2026-05-14

EPSS Score

Score Percentile
0.25% 48.61%

CVSS Scores

Base score Version Severity Vector
7.5 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-rxvx-hhpj-q6px ↗
CVE CVE-2026-44671 ↗

CWEs

CWE id Name
CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Credits

  • Proscan-one (reporter)
  • livio-a (remediation_developer)
  • wim07101993 (remediation_reviewer)

Affected packages (3)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/zitadel/zitadel >= 4.0.0, <= 4.14.0 4.15.0 —
go github.com/zitadel/zitadel >= 2.71.11, <= 2.71.19 — —
go github.com/zitadel/zitadel >= 3.1.0, <= 3.4.9 3.4.10 —

References

cvelogic Threat Intelligence