CVE-2021-47918: Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfilt

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HIGH 8.1DOWNGRADE

CVE-2021-47918 is a high-severity flaw (CVSS 8.1) affecting simple cms php. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfiltered SQL commands in the users module. Attackers can exploit unvalidated input parameters in the admin.php file to compromise the database management system and web application.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-02-01
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: simplephpscripts

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

Am I affected?

Timeline

2026-02-01 13:15 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

simplephpscripts simple cms php DOWNGRADE

Affected: 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison simple-cms-php sudo apt install simple-cms-php=<VERSION_BEFORE_2.1> sudo apt-mark hold simple-cms-php

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

dnf --showduplicates list simple-cms-php sudo dnf downgrade simple-cms-php-<VERSION_BEFORE_2.1> sudo dnf versionlock add simple-cms-php

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-2021-47918?

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

Is CVE-2021-47918 being exploited?

CVE-2021-47918 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-2021-47918 affect?

CVE-2021-47918 affects simple cms php. Severity is high (CVSS 8.1). Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfiltered SQL commands in the users module. Attackers can exploit unvalidated input parameters in the admin.php file to compromise the

How urgent is CVE-2021-47918?

Priority 45/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2021-47917 MEDIUM 6.4 DOWNGRADE Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows r

References

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