CVE-2023-51295Public exploitNetwork attack vector

Unauthenticated HTML injection via unsanitized form parameters

Published May 8, 2025 · Updated Nov 4, 2025

HTML injection in PHPJabbers Event Booking Calendar 4.0 allows remote attackers to alter rendered content through crafted form parameters. Published sources identify the name, plugin_sms_api_key, plugin_sms_country_code, and title inputs but do not disclose the processing path or output context that fails to neutralize their HTML markup. No authentication or user interaction is required; the documented consequence is limited to unauthorized HTML content injection.

CVSS severity6.5
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in PHPJabbers Event Booking Calendar 4.0 allows remote attackers to alter rendered content through crafted form parameters. Published sources identify the name, plugin_sms_api_key, plugin_sms_country_code, and title inputs but do not disclose the processing path or output context that fails to neutralize their HTML markup. No authentication or user interaction is required; the documented consequence is limited to unauthorized HTML content injection.

The record

CVE
CVE-2023-51295
Published
May 8, 2025
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')

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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