CVE-2022-28521: ZCMS v20170206 was discovered to contain a file inclusion vulnerability via index.php?m=home&c=home&a=sp_set_c

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-28521 is a critical-severity flaw (CVSS 9.8) affecting zcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ZCMS v20170206 was discovered to contain a file inclusion vulnerability via index.php?m=home&c=home&a=sp_set_config.

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	1.6% (top 24%)
CISA exploited list	No
Published	2022-04-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zcms project

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

Am I affected?

Timeline

2022-04-26 21:15 UTCPublished CVE record published
2026-06-17 04:38 UTCUpdated Record last modified

zcms project zcms DOWNGRADE

Affected: 20170206

Fixed in: no fixed release known

Safe to downgrade to: a release before 20170206

1. Check installed version

apt-cache policy zcms || rpm -q zcms || zcms --version

2. No fixed release: DOWNGRADE to a release before 20170206 (Debian / Ubuntu)

apt-cache madison zcms sudo apt install zcms=<VERSION_BEFORE_20170206> sudo apt-mark hold zcms

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

dnf --showduplicates list zcms sudo dnf downgrade zcms-<VERSION_BEFORE_20170206> sudo dnf versionlock add zcms

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-2022-28521?

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

Is CVE-2022-28521 being exploited?

CVE-2022-28521 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-2022-28521 affect?

CVE-2022-28521 affects zcms. Severity is critical (CVSS 9.8). ZCMS v20170206 was discovered to contain a file inclusion vulnerability via index.php?m=home&c=home&a=sp_set_config.

How urgent is CVE-2022-28521?

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

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-28522 MEDIUM 5.4 DOWNGRADE ZCMS v20170206 was discovered to contain a stored cross-site scripting (XSS) vulnerability via index.php?m=hom

References

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