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CVE-2017-0881
An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server…
Medium4.3EPSS 1.1%
- Published
- Updated
- Reserved
- Assigned by
- hackerone
Description
An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server before 1.4.3 allowed an authenticated user to subscribe to a private stream that should have required an invitation from an existing member to join. The issue affects all previously released versions of the Zulip server.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium4.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.1% · top 34% of all CVEs (3 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
Zulip Server Versions 1.4.2 and below
- affected Zulip Server Versions 1.4.2 and below
References (3)
- 97159 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2017-0881)Record last updated .