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Vulnerability record · CVE-2016-4427 · published 28 July 2022

CVE-2016-4427: Zulip improper access control vulnerability

Zulip · Zulip

In zulip before 1.3.12, deactivated users could access messages if SSO was enabled.

7.5 CVSS 3.1 High EPSS 0.75% · top 47.1% CWE-284 · Improper access control
7.5CVSS 3.1 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In zulip before 1.3.12, deactivated users could access messages if SSO was enabled.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://zulip.readthedocs.io/en/2.1.7/overview/changelog.html#id35 Release NotesThird Party Advisory
https://zulip.readthedocs.io/en/2.1.7/overview/changelog.html#id35 Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-4427), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.