CVE-2023-48831Public exploitNetwork attack vector

Service interruption via unthrottled email requests

Published Dec 7, 2023 · Updated Oct 9, 2024

Uncontrolled resource consumption in PHPJabbers Availability Booking Calendar 5.0 allows remote attackers to interrupt service via email requests. The pjActionAJaxSend action accepts repeated email-send requests without rate limiting, allowing bulk message generation to consume server resources. No authentication or user interaction is required, and the demonstrated consequence is resource exhaustion rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability1.16%
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 Availability Booking Calendar 5.0 allows remote attackers to interrupt service via email requests. The pjActionAJaxSend action accepts repeated email-send requests without rate limiting, allowing bulk message generation to consume server resources. No authentication or user interaction is required, and the demonstrated consequence is resource exhaustion rather than data disclosure or modification.

The record

CVE
CVE-2023-48831
Published
Dec 7, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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

7.5CISA-ADPCVSS: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-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

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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