# CVE-2026-72529: TrueConf Server Missing Authentication for Critical Function

> Remote attackers can execute arbitrary scripts on TrueConf Server by calling an undocumented function without authentication.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Yes, since 20 Aug 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Aug 2026
- **Updated:** 21 Aug 2026
- **Also known as:** GHSA-xc2x-q39j-746f

## What is CVE-2026-72529?

CVE-2026-72529 is a critical missing authorization vulnerability in TrueConf Server, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A remote unauthorized attacker with network access via port 4307/TCP to the TrueConf server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, 5.5.X to 5.5.5, and earlier could execute an arbitrary script by calling an undocumented function.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-72529?

It affects 1 product.


Products: Trueconf Trueconf Server.

## How do I fix CVE-2026-72529?

No fix has been published for CVE-2026-72529 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 23 Aug 2026.

## Is CVE-2026-72529 being exploited?

Yes. Attackers have exploited CVE-2026-72529 in the wild since at least 20 Aug 2026.

## Other vulnerabilities in TrueConf Server

- [CVE-2026-72530](https://insights.sbomify.com/CVE-2026-72530/): TrueConf Server Code Injection (critical 9.5, exploited in the wild)
- [CVE-2025-66824](https://insights.sbomify.com/CVE-2025-66824/): Cross-site scripting in n/a (high 7.3)
- [CVE-2025-66834](https://insights.sbomify.com/CVE-2025-66834/): Code injection in n/a (high 7.3)
- [CVE-2017-20120](https://insights.sbomify.com/CVE-2017-20120/): TrueConf Server cross-site request forgery (medium 4.3)
- [CVE-2025-66823](https://insights.sbomify.com/CVE-2025-66823/): Cross-site scripting in n/a (low 3.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-72529 and fix it if it is affected.

What it is: CVE-2026-72529 is a critical missing authorization vulnerability in TrueConf Server, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-72529 in the wild since at least 20 Aug 2026.

Affected product: TrueConf 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-2026-72529/ (Markdown: https://insights.sbomify.com/CVE-2026-72529/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-72529
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72529
- OSV: https://osv.dev/vulnerability/CVE-2026-72529

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-72529/
Summaries are generated and may contain mistakes; the official description above is the record.