CVE-2023-4110Public exploitNetwork attack vector

Browser script execution via unencoded session_id reflection

Published Aug 3, 2023 · Updated Oct 10, 2024

Reflected cross-site scripting in PHPJabbers Availability Booking Calendar 5.0 allows remote attackers to execute script in a user's browser. The pjActionGetBookingForm route in /index.php returns the session_id query value in HTML without sufficient output encoding, allowing injected markup to create a script element. A victim must open the crafted request; execution remains within the affected site's browser origin and can alter page content or access origin-readable data.

CVSS severity6.1
Medium
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in PHPJabbers Availability Booking Calendar 5.0 allows remote attackers to execute script in a user's browser. The pjActionGetBookingForm route in /index.php returns the session_id query value in HTML without sufficient output encoding, allowing injected markup to create a script element. A victim must open the crafted request; execution remains within the affected site's browser origin and can alter page content or access origin-readable data.

The record

CVE
CVE-2023-4110
Published
Aug 3, 2023
Updated
Oct 10, 2024
Vendor
PHPJabbers
Product
Availability Booking Calendar
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 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=5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PHPJabbers · Availability Booking Calendarversion=5.0

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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