# CVE-2023-29456: Inefficient URL schema validation

> Attackers can exploit inefficient URL validation to inject malicious scripts, potentially leading to code execution or security bypass in Zabbix.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:L/A:L`)
- **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:** 13 Jul 2023
- **Updated:** 3 Nov 2025
- **Also known as:** DEBIAN-CVE-2023-29456, GHSA-q598-p9hw-59vj, UBUNTU-CVE-2023-29456

## What is CVE-2023-29456?

CVE-2023-29456 is a medium-severity cross-site scripting vulnerability in Zabbix, published on 13 Jul 2023. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

URL validation scheme receives input from a user and then parses it to identify its various components. The validation scheme can ensure that all URL components comply with internet standards.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2023-29456?

It affects 1 product.


Products: Zabbix Frontend.

## How do I fix CVE-2023-29456?

Apply the vendor's patch.

## Is CVE-2023-29456 being exploited?

There is no known exploitation of CVE-2023-29456 in the wild and no public exploit code.

## Other vulnerabilities in Zabbix

- [CVE-2023-32725](https://insights.sbomify.com/CVE-2023-32725/): Leak of zbx_session cookie when using a scheduled report that includes a dashboard with a URL widget. (critical 9.6)
- [CVE-2025-27232](https://insights.sbomify.com/CVE-2025-27232/): Frontend arbitrary file read in oauth.authorize action (medium 6.8)
- [CVE-2023-29457](https://insights.sbomify.com/CVE-2023-29457/): Insufficient validation of Action form input fields (medium 6.3)
- [CVE-2025-49643](https://insights.sbomify.com/CVE-2025-49643/): Frontend DoS vulnerability due to asymmetric resource consumption (medium 6.0)
- [CVE-2023-29454](https://insights.sbomify.com/CVE-2023-29454/): Persistent XSS in the user form (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-29456 and fix it if it is affected.

What it is: CVE-2023-29456 is a medium-severity cross-site scripting vulnerability in Zabbix, published on 13 Jul 2023. 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-2023-29456 in the wild and no public exploit code.

Affected product: 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-2023-29456/ (Markdown: https://insights.sbomify.com/CVE-2023-29456/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-29456
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-29456
- OSV: https://osv.dev/vulnerability/CVE-2023-29456

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-29456/
Summaries are generated and may contain mistakes; the official description above is the record.