What’s Vulnerable › Vulnerabilities

CVE-2016-4427

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-07-28 · updated 2026-06-17
• Weakness: CWE-284

Description

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

Affected products

• zulip: before 1.3.12 — fixed in 1.3.12

How to fix

Upgrade to a fixed version: zulip 1.3.12. Check the vendor advisory for mitigations.

References

• https://zulip.readthedocs.io/en/2.1.7/overview/changelog.html#id35
• https://zulip.readthedocs.io/en/2.1.7/overview/changelog.html#id35

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