CVE-2026-27946Network attack vector

Contact self-verification via missing permission check

Published Feb 26, 2026 · Updated Feb 26, 2026

Missing authorization in ZITADEL before 3.4.7 and 4.0.0 through 4.11.0 allows remote authenticated users to self-verify contact data. ChangeUserHuman treats self-management as sufficient permission even when UpdateHumanUser sets an email or phone Verified flag to true. A user account with self-management access can claim contact data it does not control and bypass policies that trust verified email addresses or telephone numbers.

CVSS severity8.2
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ZITADEL before 3.4.7 and 4.0.0 through 4.11.0 allows remote authenticated users to self-verify contact data. ChangeUserHuman treats self-management as sufficient permission even when UpdateHumanUser sets an email or phone Verified flag to true. A user account with self-management access can claim contact data it does not control and bypass policies that trust verified email addresses or telephone numbers.

The record

CVE
CVE-2026-27946
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
ZITADEL
Product
ZITADEL
Classifications
CWE-862, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.4.7
  2. Affected versionversion=>= 4.0.0, < 4.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ZITADEL · ZITADELversion=< 3.4.7; version=>= 4.0.0, < 4.11.0

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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