VPS.org one-click Zulip template deployment instance contains multiple vulnerabilities

published 2026-07-31 3 mo ago modified 2026-10-23 16 d ago also EUVD-2026-51548

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

Deployment of the VPS.org one-click Zulip template deploys a hardcoded application signing key, a default database password ("zulip"), and DISABLE_HTTPS=True.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 3 mo ago (2026-08-03)

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VPS.org Zulip template

Classification

Weakness

CWE-1188 Initialization of a Resource with an Insecure Default
CWE-321 Use of Hard-coded Cryptographic Key
CWE-1393 Use of Default Password

References

kb.cert.org /vuls/id/243636

Sources

CVE List CVE-2026-16504
NVD CVE-2026-16504

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary