CVE-2023-39343Network attack vector

Username enumeration via raw authentication exception messages

Published Aug 4, 2023 · Updated Oct 3, 2024

Username enumeration in Sulu 2.5.0 through 2.5.9 allows attackers to identify accounts through the Admin Login form. AuthenticationHandler returns the raw authentication exception message for failed AJAX logins, producing different content for existing and nonexistent usernames or email addresses. Exposure requires the newer Symfony Security system, which is standard with Symfony 6.0 and optional with Symfony 5.4, and discloses account existence only.

CVSS severity4.3
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

Username enumeration in Sulu 2.5.0 through 2.5.9 allows attackers to identify accounts through the Admin Login form. AuthenticationHandler returns the raw authentication exception message for failed AJAX logins, producing different content for existing and nonexistent usernames or email addresses. Exposure requires the newer Symfony Security system, which is standard with Symfony 6.0 and optional with Symfony 5.4, and discloses account existence only.

The record

CVE
CVE-2023-39343
Published
Aug 4, 2023
Updated
Oct 3, 2024
Vendor
Sulu
Product
Sulu
Classifications
CWE-204, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 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=>= 2.5.0, < 2.5.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sulu · Suluversion=>= 2.5.0, < 2.5.10

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
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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