CVE-2023-40763Public exploitNetwork attack vector

User enumeration via differing recovery messages

Published Aug 28, 2023 · Updated Oct 2, 2024

User enumeration in PHPJabbers Taxi Booking Script 2.0 allows remote attackers to identify valid users through password recovery. The password-recovery endpoint returns distinguishable messages for registered and unregistered users, exposing an account-validity oracle. No authentication or user interaction is required; disclosed account names can focus later password-guessing attempts, but this flaw does not itself grant access.

CVSS severity9.8
Critical
EPSS probability1.11%
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 Taxi Booking Script 2.0 allows remote attackers to identify valid users through password recovery. The password-recovery endpoint returns distinguishable messages for registered and unregistered users, exposing an account-validity oracle. No authentication or user interaction is required; disclosed account names can focus later password-guessing attempts, but this flaw does not itself grant access.

The record

CVE
CVE-2023-40763
Published
Aug 28, 2023
Updated
Oct 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-209, T1589
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-209Generation of Error Message Containing Sensitive Information
T1589Gather Victim Identity Information

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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