CVE-2018-16352: There is a PHP code upload vulnerability in WeaselCMS 0.3.6 via index.php because code can be embedded at the

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-16352 is a critical-severity flaw (CVSS 9.8) affecting weaselcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is a PHP code upload vulnerability in WeaselCMS 0.3.6 via index.php because code can be embedded at the end of a .png file when the image/png content type is used.

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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-434
Published	2018-09-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: weaselcms project

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

Am I affected?

Timeline

2018-09-02 22:29 UTCPublished CVE record published
2026-06-17 01:44 UTCUpdated Record last modified

weaselcms project weaselcms DOWNGRADE

Affected: 0.3.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.3.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.3.6 (Debian / Ubuntu)

apt-cache madison weaselcms sudo apt install weaselcms=<VERSION_BEFORE_0.3.6> sudo apt-mark hold weaselcms

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

dnf --showduplicates list weaselcms sudo dnf downgrade weaselcms-<VERSION_BEFORE_0.3.6> sudo dnf versionlock add weaselcms

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-2018-16352?

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

Is CVE-2018-16352 being exploited?

CVE-2018-16352 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-2018-16352 affect?

CVE-2018-16352 affects weaselcms. Severity is critical (CVSS 9.8). There is a PHP code upload vulnerability in WeaselCMS 0.3.6 via index.php because code can be embedded at the end of a .png file when the image/png content type is used.

How urgent is CVE-2018-16352?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2018-17361 MEDIUM 6.1 DOWNGRADE Multiple XSS vulnerabilities in WeaselCMS v0.3.6 allow remote attackers to inject arbitrary web script or HTML
CVE-2018-14877 MEDIUM 5.4 DOWNGRADE An issue was discovered in WeaselCMS v0.3.5

References

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