CVE-2021-42080: Reflected XSS vulnerability in OSNEXUS QuantaStor before 6.0.0.355

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-10 · updated 2026-06-17
Weakness: CWE-79

Description

An attacker is able to launch a Reflected XSS attack using a crafted URL. POC: Visit the following URL https://<IPADDRESS>:8153/qstorapi/echo?inputMessage=<img%20src=x%20onerror=alert(document.cookie)>

Affected products

OSNEXUS QuantaStor: before 6.0.0.355 — fixed in 6.0.0.355

How to fix

Upgrade to a fixed version: OSNEXUS QuantaStor 6.0.0.355. Check the vendor advisory for mitigations.

References

https://csirt.divd.nl/CVE-2021-42080
https://csirt.divd.nl/DIVD-2021-00020/
https://www.osnexus.com/products/software-defined-storage
https://www.wbsec.nl/osnexus
https://csirt.divd.nl/CVE-2021-42080
https://www.divd.nl/DIVD-2021-00020
https://www.osnexus.com/products/software-defined-storage
https://www.wbsec.nl/osnexus

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