CVE-2023-3221Network attack vector

User enumeration via recovery response discrepancy

Published Sep 4, 2023 · Updated Sep 30, 2024

User enumeration in AlfnRU Roundcube Password Recovery Plugin 1.2 allows remote attackers to identify users through recovery requests. INCIBE identifies an observable response discrepancy in the recovery function but does not disclose which response property differs for valid and invalid accounts. No authentication or user interaction is required, and successful probing reveals whether accounts exist without changing their data.

CVSS severity5.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

User enumeration in AlfnRU Roundcube Password Recovery Plugin 1.2 allows remote attackers to identify users through recovery requests. INCIBE identifies an observable response discrepancy in the recovery function but does not disclose which response property differs for valid and invalid accounts. No authentication or user interaction is required, and successful probing reveals whether accounts exist without changing their data.

The record

CVE
CVE-2023-3221
Published
Sep 4, 2023
Updated
Sep 30, 2024
Vendor
AlfnRU
Product
Roundcube Password Recovery Plugin
Classifications
CWE-204, CAPEC-541, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 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=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AlfnRU · Roundcube Password Recovery Pluginversion=1.2

Published CVSS scores

5.3INCIBECVSS: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
CAPEC-541Application Fingerprinting
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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