CVE-2026-50040

MEDIUM 6.1

Cross-site Scripting in StoneFly Storage Concentrator

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	stonefly
Product	storage concentrator
Published	Jun 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

StoneFly / Storage Concentrator

0 < 8.0.4.22

StoneFly / Storage Concentrator Virtual Machine

0 < 8.0.4.22

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-181-06 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-181-06.json stonefly.com: https://stonefly.com/contact-us/

Credits

🔍 David Yesland of Rhino Security Labs reported this vulnerability to CISA.