CVE-2018-17361: Multiple XSS vulnerabilities in WeaselCMS v0.3.6 allow remote attackers to inject arbitrary web script or HTML

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MEDIUM 6.1DOWNGRADE

CVE-2018-17361 is a medium-severity flaw (CVSS 6.1) affecting weaselcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple XSS vulnerabilities in WeaselCMS v0.3.6 allow remote attackers to inject arbitrary web script or HTML via the PATH_INFO to index.php because $_SERVER['PHP_SELF'] is mishandled.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-09-23
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

2018-09-23 18:29 UTCPublished CVE record published
2026-06-17 01:45 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-2018-17361?

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

Is CVE-2018-17361 being exploited?

CVE-2018-17361 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-2018-17361 affect?

CVE-2018-17361 affects weaselcms. Severity is medium (CVSS 6.1). Multiple XSS vulnerabilities in WeaselCMS v0.3.6 allow remote attackers to inject arbitrary web script or HTML via the PATH_INFO to index.php because $_SERVER['PHP_SELF'] is mishandled.

How urgent is CVE-2018-17361?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2018-16352 CRITICAL 9.8 DOWNGRADE There is a PHP code upload vulnerability in WeaselCMS 0.3.6 via index.php because code can be embedded at the
CVE-2018-14877 MEDIUM 5.4 DOWNGRADE An issue was discovered in WeaselCMS v0.3.5

References

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