CVE-2020-19274: A Cross SIte Scripting (XSS) vulnerability exists in Dhcms 2017-09-18 in guestbook via the message board, whic

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MEDIUM 6.1DOWNGRADE

CVE-2020-19274 is a medium-severity flaw (CVSS 6.1) affecting dhcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Cross SIte Scripting (XSS) vulnerability exists in Dhcms 2017-09-18 in guestbook via the message board, which could let a remote malicious user execute arbitrary code.

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	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dhcms project

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

Am I affected?

Timeline

2021-05-12 17:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

dhcms project dhcms DOWNGRADE

Affected: 2017-09-18

Fixed in: no fixed release known

Safe to downgrade to: a release before 2017-09-18

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2017-09-18 (Debian / Ubuntu)

apt-cache madison dhcms sudo apt install dhcms=<VERSION_BEFORE_2017-09-18> sudo apt-mark hold dhcms

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

dnf --showduplicates list dhcms sudo dnf downgrade dhcms-<VERSION_BEFORE_2017-09-18> sudo dnf versionlock add dhcms

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-2020-19274?

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

Is CVE-2020-19274 being exploited?

CVE-2020-19274 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-2020-19274 affect?

CVE-2020-19274 affects dhcms. Severity is medium (CVSS 6.1). A Cross SIte Scripting (XSS) vulnerability exists in Dhcms 2017-09-18 in guestbook via the message board, which could let a remote malicious user execute arbitrary code.

How urgent is CVE-2020-19274?

Priority 41/100. Public exploit reference

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References

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