What is CVE-2026-121515?

CVE-2026-121515 is a medium-severity vulnerability in Foliovision Fv Flowplayer Video Player, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-11-07.

How severe is CVE-2026-121515?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Foliovision Fv Flowplayer Video Player

CVE-2026-121515

The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 7.5.56.7212 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the 'Parse Vimeo and YouTube links' option to be enabled, and the injected comment must be approved before the script executes for site visitors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-07 · last modified 2026-11-07.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Foliovision Fv Flowplayer Video Player

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-121515?: CVE-2026-121515 is a medium-severity vulnerability in Foliovision Fv Flowplayer Video Player, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-11-07.
How severe is CVE-2026-121515?: Medium severity. CVSS v3 base score is 5.4 out of 10.