CVE-2023-24058: Booked Scheduler 2.5.5 allows authenticated users to create and schedule events for any other user via a modif

Routine

MEDIUM 4.3DOWNGRADE

CVE-2023-24058 is a medium-severity flaw (CVSS 4.3) affecting booked. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Booked Scheduler 2.5.5 allows authenticated users to create and schedule events for any other user via a modified userId value to reservation_save.php. NOTE: 2.5.5 is a version from 2014; the latest version of Booked Scheduler is not affected. However, LabArchives Scheduler (Sep 6, 2022 Feature Release) is affected.

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	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-284
Published	2023-01-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: twinkletoessoftware

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

Am I affected?

Timeline

2023-01-22 06:15 UTCPublished CVE record published
2026-06-17 05:38 UTCUpdated Record last modified

twinkletoessoftware booked DOWNGRADE

Affected: 2.5.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.5

1. Check installed version

apt-cache policy booked || rpm -q booked || booked --version

2. No fixed release: DOWNGRADE to a release before 2.5.5 (Debian / Ubuntu)

apt-cache madison booked sudo apt install booked=<VERSION_BEFORE_2.5.5> sudo apt-mark hold booked

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

dnf --showduplicates list booked sudo dnf downgrade booked-<VERSION_BEFORE_2.5.5> sudo dnf versionlock add booked

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-2023-24058?

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

Is CVE-2023-24058 being exploited?

CVE-2023-24058 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-2023-24058 affect?

CVE-2023-24058 affects booked. Severity is medium (CVSS 4.3). Booked Scheduler 2.5.5 allows authenticated users to create and schedule events for any other user via a modified userId value to reservation_save.php. NOTE: 2.5.5 is a version from 2014; the latest version of Booked Scheduler is not affect

How urgent is CVE-2023-24058?

Priority 36/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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