CVE-2023-36127Public exploitNetwork attack vector

Unauthenticated user enumeration via recovery message discrepancy

Published Oct 10, 2023 · Updated Sep 19, 2024

User enumeration in PHPJabbers Appointment Scheduler 3.0 allows remote attackers to identify valid accounts through password recovery. The Forgot Password workflow returns a distinct message when a submitted email address does not belong to a user instead of giving a uniform response. No authentication or user interaction is required, and the disclosed account validity can supply confirmed usernames for later password guessing.

CVSS severity7.5
High
EPSS probability0.59%
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 PHPJabbers Appointment Scheduler 3.0 allows remote attackers to identify valid accounts through password recovery. The Forgot Password workflow returns a distinct message when a submitted email address does not belong to a user instead of giving a uniform response. No authentication or user interaction is required, and the disclosed account validity can supply confirmed usernames for later password guessing.

The record

CVE
CVE-2023-36127
Published
Oct 10, 2023
Updated
Sep 19, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-203, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy
T1087Account Discovery

Public exploit references

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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