CVE-2026-16504 VPS.org one-click Zulip template deployment instance contains multiple vulnerabilities
Critical 9.8
Published
Updated
Check this codebase for CVE-2026-16504 and fix it if it is affected.
What it is: CVE-2026-16504 is a critical vulnerability in VPS.org Zulip template, published on 31 Jul 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-2026-16504 in the wild and no public exploit code.
Affected product: VPS.org Zulip template. 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-2026-16504/ (Markdown: https://insights.sbomify.com/CVE-2026-16504/index.md)
The VPS.org Zulip template uses hardcoded keys and default passwords, allowing attackers to bypass authentication and compromise the instance.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16504?
CVE-2026-16504 is a critical vulnerability in VPS.org Zulip template, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Deployment of the VPS.org one-click Zulip template deploys a hardcoded application signing key, a default database password ("zulip"), and DISABLE_HTTPS=True.
Which versions are affected by CVE-2026-16504?
How do I fix CVE-2026-16504?
No fix has been published for CVE-2026-16504 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-16504 being exploited?
There is no known exploitation of CVE-2026-16504 in the wild and no public exploit code.
Sources
Also known as GHSA-8h3p-4mcm-phwx.