What is CVE-2026-50040?

CVE-2026-50040 is a medium-severity vulnerability in Stonefly Storage Concentrator, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-30.

How severe is CVE-2026-50040?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Stonefly Storage Concentrator

CVE-2026-50040

Storage Concentrator (SC & SCVM) is vulnerable to reflected cross-site scripting due to unsanitized content being echoed back in 404 error pages. An attacker can craft a malicious URL that, when visited by an authenticated user, causes arbitrary script content to execute within the victim's browser session in the context of the application. This could be leveraged to steal session cookies, redirect users, or perform unauthorized actions on behalf of the victim.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Stonefly Storage Concentrator — versions 0, 8.0.4.29
Stonefly Storage Concentrator Virtual Machine — versions 0, 8.0.4.29

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-50040?: CVE-2026-50040 is a medium-severity vulnerability in Stonefly Storage Concentrator, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-30.
How severe is CVE-2026-50040?: Medium severity. CVSS v3 base score is 6.1 out of 10.