CVE-2023-53927: PHPJabbers Simple CMS 5.0 contains a stored cross-site scripting vulnerability that allows authenticated attac

Routine

MEDIUM 5.4DOWNGRADE

CVE-2023-53927 is a medium-severity flaw (CVSS 5.4) affecting simple cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHPJabbers Simple CMS 5.0 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts through section name parameters. Attackers can create sections with embedded JavaScript payloads that will execute when administrators view the sections, potentially enabling client-side code execution.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-12-17
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: phpjabbers

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

Am I affected?

Timeline

2025-12-17 23:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

phpjabbers simple cms DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy simple-cms || rpm -q simple-cms || simple-cms --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison simple-cms sudo apt install simple-cms=<VERSION_BEFORE_5.0> sudo apt-mark hold simple-cms

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

dnf --showduplicates list simple-cms sudo dnf downgrade simple-cms-<VERSION_BEFORE_5.0> sudo dnf versionlock add simple-cms

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-2023-53927?

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

Is CVE-2023-53927 being exploited?

CVE-2023-53927 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-2023-53927 affect?

CVE-2023-53927 affects simple cms. Severity is medium (CVSS 5.4). PHPJabbers Simple CMS 5.0 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts through section name parameters. Attackers can create sections with embedded JavaScript payloads

How urgent is CVE-2023-53927?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2023-53926 CRITICAL 9.8 DOWNGRADE PHPJabbers Simple CMS 5.0 contains a SQL injection vulnerability in the 'column' parameter that allows remote

References

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