# CVE-2021-26589: Cross-site scripting in HPE Superdome Flex Server

> Attackers can exploit missing HttpOnly attributes on session cookies to perform Cross-Site Scripting attacks on HPE Superdome Flex Servers.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Oct 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-f33r-fh9w-f296

## What is CVE-2021-26589?

CVE-2021-26589 is a medium-severity cross-site scripting vulnerability in HPE Superdome Flex Server, published on 19 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2021-26589?

It affects 2 products.


Products: Hpe Superdome Flex 280 Firmware, Hpe Superdome Flex Firmware.

## How do I fix CVE-2021-26589?

No fix has been published for CVE-2021-26589 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26589 being exploited?

There is no known exploitation of CVE-2021-26589 in the wild and no public exploit code.

## Other vulnerabilities in HPE Superdome Flex Server

- [CVE-2022-37933](https://insights.sbomify.com/CVE-2022-37933/): Other in HPE Superdome Flex Server; HPE Superdome Flex 280 Server (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26589 and fix it if it is affected.

What it is: CVE-2021-26589 is a medium-severity cross-site scripting vulnerability in HPE Superdome Flex Server, published on 19 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-26589 in the wild and no public exploit code.

Affected product: HPE Superdome Flex Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-26589/ (Markdown: https://insights.sbomify.com/CVE-2021-26589/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26589
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26589
- OSV: https://osv.dev/vulnerability/CVE-2021-26589

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26589/
Summaries are generated and may contain mistakes; the official description above is the record.