CVE-2020-35373: In Fiyo CMS 2.0.6.1, the 'tag' parameter results in an unauthenticated XSS attack.

This month

MEDIUM 6.1DOWNGRADE

CVE-2020-35373 is a medium-severity flaw (CVSS 6.1) affecting fiyo cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Fiyo CMS 2.0.6.1, the 'tag' parameter results in an unauthenticated XSS attack.

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 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-06-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fiyo

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

Am I affected?

Timeline

2021-06-17 16:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

fiyo fiyo cms DOWNGRADE

Affected: 2.0.6.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.6.1

1. Check installed version

apt-cache policy fiyo-cms || rpm -q fiyo-cms || fiyo-cms --version

2. No fixed release: DOWNGRADE to a release before 2.0.6.1 (Debian / Ubuntu)

apt-cache madison fiyo-cms sudo apt install fiyo-cms=<VERSION_BEFORE_2.0.6.1> sudo apt-mark hold fiyo-cms

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

dnf --showduplicates list fiyo-cms sudo dnf downgrade fiyo-cms-<VERSION_BEFORE_2.0.6.1> sudo dnf versionlock add fiyo-cms

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-2020-35373?

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

Is CVE-2020-35373 being exploited?

CVE-2020-35373 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-2020-35373 affect?

CVE-2020-35373 affects fiyo cms. Severity is medium (CVSS 6.1). In Fiyo CMS 2.0.6.1, the 'tag' parameter results in an unauthenticated XSS attack.

How urgent is CVE-2020-35373?

Priority 40/100. Public exploit reference

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References

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