CVE-2020-18445: Cross Site Scripting (XSS) vulnerability exists in YUNUCMS 1.1.9 via the upurl function in Page.php.

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MEDIUM 6.1DOWNGRADE

CVE-2020-18445 is a medium-severity flaw (CVSS 6.1) affecting yunucms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability exists in YUNUCMS 1.1.9 via the upurl function in Page.php.

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	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yunucms

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

Am I affected?

Timeline

2021-08-12 17:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

yunucms yunucms DOWNGRADE

Affected: 1.1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1.9 (Debian / Ubuntu)

apt-cache madison yunucms sudo apt install yunucms=<VERSION_BEFORE_1.1.9> sudo apt-mark hold yunucms

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

dnf --showduplicates list yunucms sudo dnf downgrade yunucms-<VERSION_BEFORE_1.1.9> sudo dnf versionlock add yunucms

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-2020-18445?

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

Is CVE-2020-18445 being exploited?

CVE-2020-18445 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-2020-18445 affect?

CVE-2020-18445 affects yunucms. Severity is medium (CVSS 6.1). Cross Site Scripting (XSS) vulnerability exists in YUNUCMS 1.1.9 via the upurl function in Page.php.

How urgent is CVE-2020-18445?

Priority 40/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-18446 MEDIUM 4.8 DOWNGRADE Cross Site Scripting (XSS) vulnerability exists in YUNUCMS 1.1.9 via the param parameter in the insertContent

References

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