Is CVE-2021-26589 actively exploited?

No active exploitation of CVE-2021-26589 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26589 be exploited remotely?

Yes. CVE-2021-26589 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26589?

CVE-2021-26589 has a CVSS score of 6.1 (MEDIUM).

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MEDIUM

CVE-2021-26589

CWE-732Published: October 19, 2021· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

A potential security vulnerability has been identified in HPE Superdome Flex Servers. The vulnerability could be remotely exploited to allow Cross Site Scripting (XSS) because the Session Cookie is missing an HttpOnly Attribute. HPE has provided a firmware update to resolve the vulnerability in HPE Superdome Flex Servers.

NVD Source

Technical Analysis

CVE-2021-26589 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.