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

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-53926 is a critical-severity flaw (CVSS 9.8) 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 SQL injection vulnerability in the 'column' parameter that allows remote attackers to manipulate database queries. Attackers can inject crafted SQL payloads through the 'column' parameter in the index.php endpoint to potentially extract or modify database information.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-89
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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · conan · FIXED · 2.31.0-1.fc46 · FEDORA-2026-ba58084ab5 · source

sudo dnf upgrade --advisory=FEDORA-2026-ba58084ab5

Fedora ELN · tesseract · FIXED · 5.5.4-1.eln159 · FEDORA-2026-866cf60ee6 · source

sudo dnf upgrade --advisory=FEDORA-2026-866cf60ee6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/51416

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-2023-53926?

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

Is CVE-2023-53926 being exploited?

CVE-2023-53926 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-2023-53926 affect?

CVE-2023-53926 affects simple cms. Severity is critical (CVSS 9.8). PHPJabbers Simple CMS 5.0 contains a SQL injection vulnerability in the 'column' parameter that allows remote attackers to manipulate database queries. Attackers can inject crafted SQL payloads through the 'column' parameter in the index.ph

How urgent is CVE-2023-53926?

Priority 57/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-53927 MEDIUM 5.4 DOWNGRADE PHPJabbers Simple CMS 5.0 contains a stored cross-site scripting vulnerability that allows authenticated attac

References

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