CVE-2021-24495

Marmoset Viewer < 1.9.3 - Reflected Cross Site Scripting

6.1 Medium

The Marmoset Viewer WordPress plugin before 1.9.3 does not property sanitize, validate or escape the 'id' parameter before outputting back in the page, leading to a reflected Cross-Site Scripting issue.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

3.34%Up 2.7 points since Aug 10, 2021

What each source reports

NVD Score used 6.1

Record: CVE-2021-24495
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Marmoset Viewer < 1.9.3 - Reflected Cross Site Scripting

Record: CVE-2021-24495
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2021-11407 No score

Record: EUVD-2021-11407
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4r3v-6fhp-p4mw No score

The Marmoset Viewer WordPress plugin before 1.9.3 does not property sanitize, validate or escape...

Record: GHSA-4r3v-6fhp-p4mw
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	Wordpress Marmoset Viewer <1.9.3 - Cross-Site Scripting

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, Nuclei, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-24495 is a medium vulnerability (CVSS 6.1) in Marmoset Viewer, published August 9, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.34%, the 88th percentile. No source names a fixed version.