CVE-2023-39522Network attack vector

Username enumeration via recovery response discrepancy

Published Aug 29, 2023 · Updated Oct 1, 2024

Information disclosure in authentik before 2023.5.6 and 2023.6.0 through 2023.6.1 allows remote attackers to enumerate usernames. The recovery flow's identification stage returns a failure for an unknown identifier instead of continuing with the same email-sent response used for an existing account. Exposure requires a configured recovery flow with an identification stage and reveals whether a submitted username or email address belongs to an account.

CVSS severity5.3
Medium
EPSS probability0.62%
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 authentik before 2023.5.6 and 2023.6.0 through 2023.6.1 allows remote attackers to enumerate usernames. The recovery flow's identification stage returns a failure for an unknown identifier instead of continuing with the same email-sent response used for an existing account. Exposure requires a configured recovery flow with an identification stage and reveals whether a submitted username or email address belongs to an account.

The record

CVE
CVE-2023-39522
Published
Aug 29, 2023
Updated
Oct 1, 2024
Vendor
Authentik Security Inc.
Product
authentik
Classifications
CWE-204, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record 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=< 2023.5.6
  2. Affected versionversion=>= 2023.6.0, < 2023.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Authentik Security Inc. · authentikversion=< 2023.5.6; version=>= 2023.6.0, < 2023.6.2

Published CVSS scores

5.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
T1087Account Discovery

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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