CVE-2021-37333: Laravel Booking System Booking Core 2.0 is vulnerable to Session Management

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-37333 is a critical-severity flaw (CVSS 9.8) affecting booking core. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Laravel Booking System Booking Core 2.0 is vulnerable to Session Management. A password change at sandbox.bookingcore.org/user/profile/change-password does not invalidate a session that is opened in a different browser.

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-613
Published	2021-10-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bookingcore

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

Am I affected?

Timeline

2021-10-04 14:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

bookingcore booking core DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy booking-core || rpm -q booking-core || booking-core --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison booking-core sudo apt install booking-core=<VERSION_BEFORE_2.0> sudo apt-mark hold booking-core

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

dnf --showduplicates list booking-core sudo dnf downgrade booking-core-<VERSION_BEFORE_2.0> sudo dnf versionlock add booking-core

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-2021-37333?

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

Is CVE-2021-37333 being exploited?

CVE-2021-37333 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-2021-37333 affect?

CVE-2021-37333 affects booking core. Severity is critical (CVSS 9.8). Laravel Booking System Booking Core 2.0 is vulnerable to Session Management. A password change at sandbox.bookingcore.org/user/profile/change-password does not invalidate a session that is opened in a different browser.

How urgent is CVE-2021-37333?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Laravel vulnerabilities

Related CVEs

CVE-2021-37331 MEDIUM 5.3 DOWNGRADE Laravel Booking System Booking Core 2.0 is vulnerable to Incorrect Access Control
CVE-2021-37330 MEDIUM 5.4 DOWNGRADE Laravel Booking System Booking Core 2.0 is vulnerable to Cross Site Scripting (XSS)
CVE-2020-27379 MEDIUM 6.5 DOWNGRADE Cross Site Request Forgery (CSRF) vulnerability in Booking Core - Ultimate Booking System Booking Core 1.7.0
CVE-2020-25445 HIGH 7.8 DOWNGRADE The “Subscribe” feature in Ultimate Booking System Booking Core 1.7.0 is vulnerable to CSV formula injection
CVE-2020-25444 MEDIUM 5.4 DOWNGRADE Cross Site Scripting (XSS) vulnerability in Booking Core - Ultimate Booking System Booking Core 1.7.0 via the

References

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