CVE-2023-2823: A vulnerability was found in SourceCodester Class Scheduling System 1.0

This month

MEDIUM 6.3DOWNGRADE

CVE-2023-2823 is a medium-severity flaw (CVSS 6.3) affecting class scheduling system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in SourceCodester Class Scheduling System 1.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file /admin/edit_subject.php of the component GET Parameter Handler. The manipulation of the argument id leads to sql injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-229597 was assigned to this vu

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-89
Published	2023-05-20
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: class scheduling system project

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

Am I affected?

Timeline

2023-05-20 08:15 UTCPublished CVE record published
2026-06-17 05:53 UTCUpdated Record last modified

class scheduling system project class scheduling system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy class-scheduling-system || rpm -q class-scheduling-system || class-scheduling-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison class-scheduling-system sudo apt install class-scheduling-system=<VERSION_BEFORE_1.0> sudo apt-mark hold class-scheduling-system

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

dnf --showduplicates list class-scheduling-system sudo dnf downgrade class-scheduling-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add class-scheduling-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-2023-2823?

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

Is CVE-2023-2823 being exploited?

CVE-2023-2823 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-2023-2823 affect?

CVE-2023-2823 affects class scheduling system. Severity is medium (CVSS 6.3). A vulnerability was found in SourceCodester Class Scheduling System 1.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file /admin/edit_subject.php of the component GET Parameter Handler

How urgent is CVE-2023-2823?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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