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

published 2021-06-17 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23049

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

loganclaw.com http://loganclaw.com/2020/12/07/fiyo-cms-reflected-xss/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

loganclaw.com /2020/12/07/fiyo-cms-reflected-xss/
exploit, third-party-advisory, url-repurposed

Sources

CVE List CVE-2020-35373
NVD CVE-2020-35373

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary