CVE intelligence and bounded remediation
CVE-2017-0896 — Zulip Zulip Server security vulnerability
Zulip Server 1.5.1 and below suffer from an error in the implementation of the invite_by_admins_only setting in the Zulip group chat application server that allowed an authenticated user to invite other users to join a Zulip organization even if the organization was configured to prevent this.
- Severity
- Medium
- CVSS
- 6.5 (3.0)
- Published
- 2017-06-02
- CISA KEV
- Not currently listed
- Ecosystem
- software/application
- Weaknesses
- CWE-285, CWE-862
Affected products
- zulip / zulip_server / 1.3.0
- zulip / zulip_server / 1.3.1
- zulip / zulip_server / 1.3.2
- zulip / zulip_server / 1.3.3
- zulip / zulip_server / 1.3.4
- zulip / zulip_server / 1.3.6
Showing 6 representative product identities from 19 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.
Matched remediation archetype
Authorization bypass, IDOR, and cross-tenant access
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
- Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
- Use synthetic fixtures to compare intended access matrices without accessing another user's real data.
Remediate safely
- Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
- Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
- Add deny-by-default policy tests for horizontal and vertical access across every affected transport.
Authoritative sources
Complete CVE record and remediation plan
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