CVE-2023-51295: PHPJabbers Event Booking Calendar v4.0 is vulnerable to Multiple HTML Injection in the "name, plugin_sms_api_k

This week

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2023-51295 is a medium-severity flaw (CVSS 6.5) affecting event booking calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHPJabbers Event Booking Calendar v4.0 is vulnerable to Multiple HTML Injection in the "name, plugin_sms_api_key, plugin_sms_country_code, title, plugin_sms_api_key, title" parameters.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-77
Published	2025-05-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpjabbers

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-08 16:15 UTCPublished CVE record published
2026-06-17 06:40 UTCUpdated Record last modified

phpjabbers event booking calendar DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy event-booking-calendar || rpm -q event-booking-calendar || event-booking-calendar --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison event-booking-calendar sudo apt install event-booking-calendar=<VERSION_BEFORE_4.0> sudo apt-mark hold event-booking-calendar

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list event-booking-calendar sudo dnf downgrade event-booking-calendar-<VERSION_BEFORE_4.0> sudo dnf versionlock add event-booking-calendar

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-51295?

event booking calendar: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-51295 being exploited?

CVE-2023-51295 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-51295 affect?

CVE-2023-51295 affects event booking calendar. Severity is medium (CVSS 6.5). PHPJabbers Event Booking Calendar v4.0 is vulnerable to Multiple HTML Injection in the "name, plugin_sms_api_key, plugin_sms_country_code, title, plugin_sms_api_key, title" parameters.

How urgent is CVE-2023-51295?

Priority 41/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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