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
Published Mar 28, 2017
4.3
MEDIUMCVSS 3.0
EPSS 1.10%
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.
Affected products
- Vendor n/a Product Zulip Server Versions 1.4.2 and below Defaultn/a
- Version Zulip Server Versions 1.4.2 and belowStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Zulip Server Versions 1.4.2 and below | n/a |
|
- < 1.4.3
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
AV:N/AC:L/Au:S/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.10% (0.01103) | 64.49th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.10% (0.01103) | 64.25th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.06% (0.00064) | 28.36th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.06% (0.00064) | 27.97th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00064) | 25.96th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00890) | 12.04th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (3)
- http://www.securityfocus.com/bid/97159 vdb-entryx_refsource_BIDThird Party AdvisoryVendor Advisory
- https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f x_refsource_MISCPatchThird Party Advisory
- https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ x_refsource_MISCPatchRelease NotesThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/97159 | vdb-entryx_refsource_BIDThird Party AdvisoryVendor Advisory | |
| https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f | x_refsource_MISCPatchThird Party Advisory | |
| https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ | x_refsource_MISCPatchRelease NotesThird Party Advisory |
Change history (0)
No recorded changes yet.