Vulnerability · Published Jul 31, 2026 · Assigned by certcc
CVE-2026-16504VPS.org one-click Zulip template deployment instance contains multiple vulnerabilities
Critical 9.8
In plain English
A critical-severity security flaw in Zulip template from VPS.org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 58.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| VPS.org | Zulip template | N/A |
Weakness: CWE-1188, CWE-321, CWE-1393 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H