CVE-2023-36137: There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Clas

Routine

MEDIUM 6.1DOWNGRADE

CVE-2023-36137 is a medium-severity flaw (CVSS 6.1) affecting class scheduling system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Class Scheduling System 1.0.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-08-04
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

2023-08-04 00:15 UTCPublished CVE record published
2026-06-17 06:05 UTCUpdated Record last modified

phpjabbers 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-2023-36137?

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

Is CVE-2023-36137 being exploited?

CVE-2023-36137 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-2023-36137 affect?

CVE-2023-36137 affects class scheduling system. Severity is medium (CVSS 6.1). There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Class Scheduling System 1.0.

How urgent is CVE-2023-36137?

Priority 29/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-36136 MEDIUM 6.5 DOWNGRADE PHPJabbers Class Scheduling System 1.0 lacks encryption on the password when editing a user account (update us
CVE-2023-36135 HIGH 7.5 DOWNGRADE User enumeration is found in in PHPJabbers Class Scheduling System v1.0
CVE-2023-36134 CRITICAL 9.8 DOWNGRADE In PHP Jabbers Class Scheduling System 1.0, lack of verification when changing an email address and/or passwor
CVE-2023-2826 LOW 3.5 DOWNGRADE A vulnerability has been found in SourceCodester Class Scheduling System 1.0 and classified as problematic
CVE-2023-2823 MEDIUM 6.3 DOWNGRADE A vulnerability was found in SourceCodester Class Scheduling System 1.0

References

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