CVE-2026-82043Network attack vectorHinoki check available

Account enumeration via password-reset response differences

Published Oct 2, 2026 · Updated Oct 2, 2026

Account enumeration in UTMStack before 11.2.16 allows remote attackers to identify registered email addresses through password-reset requests. The POST /api/account/reset-password/init endpoint returns 200 OK for registered addresses but exposes a backend error with 500 Internal Server Error for unregistered addresses. Network access to the endpoint is sufficient to test addresses; the reported consequence is account discovery, not account takeover.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Account enumeration in UTMStack before 11.2.16 allows remote attackers to identify registered email addresses through password-reset requests. The POST /api/account/reset-password/init endpoint returns 200 OK for registered addresses but exposes a backend error with 500 Internal Server Error for unregistered addresses. Network access to the endpoint is sufficient to test addresses; the reported consequence is account discovery, not account takeover.

The record

CVE
CVE-2026-82043
Published
Oct 2, 2026
Updated
Oct 2, 2026
Vendor
UTMStack
Product
UTMStack
Classifications
T1589.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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 <11.2.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

UTMStack · UTMStackversion=0 <11.2.16

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1589.003Gather Victim Identity Information: Email Addresses

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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