# CVE-2026-23926: Stored XSS vulnerability in Host navigator widget maintenance tooltip

> An authenticated administrator can inject JavaScript into maintenance tooltips, allowing execution against other users viewing the Host navigator widget.

- **Severity:** High 7.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 6 May 2026
- **Updated:** 7 May 2026
- **Also known as:** DEBIAN-CVE-2026-23926, GHSA-v7c2-5wfc-rfff, UBUNTU-CVE-2026-23926

## What is CVE-2026-23926?

CVE-2026-23926 is a high-severity cross-site scripting vulnerability in Zabbix Zabbix, published on 6 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

An authenticated (non-super) administrator can create a maintenance period with a JavaScript payload that is executed by any user that opens tooltip for that maintenance period in the Host navigator widget. This can allow the attacker to perform unauthorized actions depending on which user opens the tooltip.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-23926?

It affects 1 product.


Products: Zabbix Zabbix.

## How do I fix CVE-2026-23926?

Apply the vendor's patch.

## Is CVE-2026-23926 being exploited?

There is no known exploitation of CVE-2026-23926 in the wild and no public exploit code.

## Other vulnerabilities in Zabbix Zabbix

- [CVE-2022-23131](https://insights.sbomify.com/CVE-2022-23131/): Zabbix Frontend Authentication Bypass (critical 9.1, exploited in the wild)
- [CVE-2007-0640](https://insights.sbomify.com/CVE-2007-0640/): Memory corruption in n/a (critical 10.0)
- [CVE-2024-42327](https://insights.sbomify.com/CVE-2024-42327/): SQL injection in user.get API (critical 9.9)
- [CVE-2024-22116](https://insights.sbomify.com/CVE-2024-22116/): Remote code execution within ping script (critical 9.9)
- [CVE-2013-3738](https://insights.sbomify.com/CVE-2013-3738/): Code injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23926 and fix it if it is affected.

What it is: CVE-2026-23926 is a high-severity cross-site scripting vulnerability in Zabbix Zabbix, published on 6 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-23926 in the wild and no public exploit code.

Affected product: Zabbix Zabbix. 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-2026-23926/ (Markdown: https://insights.sbomify.com/CVE-2026-23926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23926
- OSV: https://osv.dev/vulnerability/CVE-2026-23926

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23926/
Summaries are generated and may contain mistakes; the official description above is the record.