CVE-2023-51309: A lack of rate limiting in the 'Email Settings' feature of PHPJabbers Car Park Booking System v3.0 allows atta

Routine

MEDIUM 4.3DOWNGRADE

CVE-2023-51309 is a medium-severity flaw (CVSS 4.3) affecting car park booking system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A lack of rate limiting in the 'Email Settings' feature of PHPJabbers Car Park Booking System v3.0 allows attackers to send an excessive amount of email for a legitimate user, leading to a possible Denial of Service (DoS) via a large amount of generated e-mail messages.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-02-20
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

2025-02-20 15:15 UTCPublished CVE record published
2026-06-17 06:40 UTCUpdated Record last modified

phpjabbers car park booking system DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy car-park-booking-system || rpm -q car-park-booking-system || car-park-booking-system --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison car-park-booking-system sudo apt install car-park-booking-system=<VERSION_BEFORE_3.0> sudo apt-mark hold car-park-booking-system

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

dnf --showduplicates list car-park-booking-system sudo dnf downgrade car-park-booking-system-<VERSION_BEFORE_3.0> sudo dnf versionlock add car-park-booking-system

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-2023-51309?

car park booking system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-51309 being exploited?

CVE-2023-51309 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-2023-51309 affect?

CVE-2023-51309 affects car park booking system. Severity is medium (CVSS 4.3). A lack of rate limiting in the 'Email Settings' feature of PHPJabbers Car Park Booking System v3.0 allows attackers to send an excessive amount of email for a legitimate user, leading to a possible Denial of Service (DoS) via a large amount

How urgent is CVE-2023-51309?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2023-51311 HIGH 8.8 DOWNGRADE PHPJabbers Car Park Booking System v3.0 is vulnerable to CSV Injection vulnerability which allows an attacker
CVE-2023-51310 MEDIUM 4.3 DOWNGRADE A lack of rate limiting in the 'Forgot Password', 'Email Settings' feature of PHPJabbers Car Park Booking Syst
CVE-2023-51308 MEDIUM 6.1 DOWNGRADE PHPJabbers Car Park Booking System v3.0 is vulnerable to Multiple HTML Injection in the "name, plugin_sms_api_

References

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