# CVE-2026-43504: Missing authorization in Prosody

> Attackers can relay unauthenticated traffic via Prosody's mod_proxy65 module when enabled, bypassing access controls.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 May 2026
- **Updated:** 1 May 2026
- **Also known as:** DEBIAN-CVE-2026-43504, GHSA-gjv9-jvc7-9mhf, UBUNTU-CVE-2026-43504

## What is CVE-2026-43504?

CVE-2026-43504 is a medium-severity missing authorization vulnerability in Prosody, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5, when mod_proxy65 is enabled. Because mod_proxy65 mishandles access control in a paused scenario, relaying of unauthenticated traffic can occur.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-43504?

It affects 1 product.


Products: Prosody Prosody.

## How do I fix CVE-2026-43504?

Upgrade to a fixed version.

## Is CVE-2026-43504 being exploited?

There is no known exploitation of CVE-2026-43504 in the wild and no public exploit code.

## Other vulnerabilities in Prosody

- [CVE-2014-2745](https://insights.sbomify.com/CVE-2014-2745/): Denial of service in n/a (high 7.8)
- [CVE-2022-0217](https://insights.sbomify.com/CVE-2022-0217/): XML external entity in prosody (high 7.5)
- [CVE-2021-37601](https://insights.sbomify.com/CVE-2021-37601/): Information disclosure in n/a (high 7.5)
- [CVE-2026-43505](https://insights.sbomify.com/CVE-2026-43505/): Missing authorization in Prosody (medium 6.5)
- [CVE-2026-43506](https://insights.sbomify.com/CVE-2026-43506/): Denial of service in Prosody (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43504 and fix it if it is affected.

What it is: CVE-2026-43504 is a medium-severity missing authorization vulnerability in Prosody, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-43504 in the wild and no public exploit code.

Affected product: Prosody. 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-2026-43504/ (Markdown: https://insights.sbomify.com/CVE-2026-43504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43504
- OSV: https://osv.dev/vulnerability/CVE-2026-43504

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43504/
Summaries are generated and may contain mistakes; the official description above is the record.