CVE-2026-54396Network attack vector

Authenticated email enumeration via submitted AuthKey user ID

Published Jun 12, 2026 · Updated Jun 12, 2026

Information disclosure in MISP before 2.5.40 allows remote authenticated users to enumerate email addresses through AuthKey edit requests. After failed validation, AuthKeysController::edit queries the user dropdown with the submitted AuthKey.user_id instead of the persisted owner's ID. An account permitted to edit an AuthKey can submit arbitrary user IDs and infer corresponding email addresses from the response.

CVSS severity5.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in MISP before 2.5.40 allows remote authenticated users to enumerate email addresses through AuthKey edit requests. After failed validation, AuthKeysController::edit queries the user dropdown with the submitted AuthKey.user_id instead of the persisted owner's ID. An account permitted to edit an AuthKey can submit arbitrary user IDs and infer corresponding email addresses from the response.

The record

CVE
CVE-2026-54396
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
MISP Project
Product
MISP
Classifications
CWE-200, CAPEC-54, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 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=0 <2.5.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MISP Project · MISPversion=0 <2.5.40

Published CVSS scores

5.3CIRCLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

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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-200Exposure of Sensitive Information to an Unauthorized Actor
CAPEC-54Query System for Information
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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