CVE-2023-51316: A lack of rate limiting in the 'Forgot Password' feature of PHPJabbers Bus Reservation System v1.1 allows atta

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2023-51316 is a high-severity flaw (CVSS 7.5) affecting bus reservation 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 'Forgot Password' feature of PHPJabbers Bus Reservation System v1.1 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

High severity
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-400
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 bus reservation system DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy bus-reservation-system || rpm -q bus-reservation-system || bus-reservation-system --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison bus-reservation-system sudo apt install bus-reservation-system=<VERSION_BEFORE_1.1> sudo apt-mark hold bus-reservation-system

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

dnf --showduplicates list bus-reservation-system sudo dnf downgrade bus-reservation-system-<VERSION_BEFORE_1.1> sudo dnf versionlock add bus-reservation-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-2023-51316?

bus reservation system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-51316 being exploited?

CVE-2023-51316 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-2023-51316 affect?

CVE-2023-51316 affects bus reservation system. Severity is high (CVSS 7.5). A lack of rate limiting in the 'Forgot Password' feature of PHPJabbers Bus Reservation System v1.1 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-2023-51316?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-3139 MEDIUM 5.3 DOWNGRADE A vulnerability was found in code-projects Bus Reservation System 1.0 and classified as critical
CVE-2023-53877 CRITICAL 9.8 DOWNGRADE Bus Reservation System 1.1 contains a SQL injection vulnerability in the pickup_id parameter that allows attac
CVE-2023-51319 HIGH 8.8 DOWNGRADE PHPJabbers Bus Reservation System v1.1 is vulnerable to CSV Injection vulnerability which allows an attacker t
CVE-2023-51318 MEDIUM 5.4 DOWNGRADE PHPJabbers Bus Reservation System v1.1 is vulnerable to Multiple Stored Cross-Site Scripting (XSS) in the "tit

References

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