In zulip before 1.3.12, deactivated users could access messages if SSO was enabled.
Priority LOW 34CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
In zulip before 1.3.12, deactivated users could access messages if SSO was enabled.
Why it matters now
EPSS 0.00767 55th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | zulip | zulip 1.3.12 | — | No fix listed | CNA |
- zulip Vendor— Affected zulip 1.3.12 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2016-4427
- 2026-10-03 Alias added: GHSA-58ww-8hxm-f99f
References
More Zulip vulnerabilities
- TI-2026-20810 Zulip: Anonymous File Access After Disabling Spectator Access CVSS 3.1MEDIUM 5.3
- TI-2026-21062 Zulip: Path Traversal in Import CVSS 3.1MEDIUM 6.1
- TI-2021-19605 RabbitMQ exposes ports with weak default secrets in Zulip Server CVSS 3.1CRITICAL 9.8
- TI-2023-15953 Users who can send invitations can erroneously add users to streams during invitation in Zulip CVSS 3.1LOW 3.1
- TI-2022-13210 Zulip Server insufficient authorization for changing bot roles CVSS 3.1HIGH 8.8
- TI-2021-02864 Improper Access Control in zulip/zulip CVSS 3.1HIGH 8.8
Sources
- CVE-2016-4427 · CVE Program
- CVE-2016-4427 · NVD
- FIRST EPSS
- GHSA-58ww-8hxm-f99f · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences