CVE-2023-48840Public exploitNetwork attack vector

Service interruption via unthrottled pjActionAjaxSend requests

Published Dec 7, 2023 · Updated Aug 2, 2024

Uncontrolled resource consumption in PHPJabbers Appointment Scheduler 3.0 allows remote attackers to interrupt service with repeated AJAX requests. The pjActionAjaxSend action processes repeated unauthenticated requests without rate limiting, allowing them to consume finite server resources. No account or user interaction is required, and the documented consequence is availability loss rather than data access or modification.

CVSS severity7.5
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in PHPJabbers Appointment Scheduler 3.0 allows remote attackers to interrupt service with repeated AJAX requests. The pjActionAjaxSend action processes repeated unauthenticated requests without rate limiting, allowing them to consume finite server resources. No account or user interaction is required, and the documented consequence is availability loss rather than data access or modification.

The record

CVE
CVE-2023-48840
Published
Dec 7, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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