What’s Vulnerable › Vulnerabilities

CVE-2021-3967: Improper Access Control in zulip/zulip

• Severity: high (CVSS 8.8 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: yes
• Published: 2022-02-26 · updated 2026-06-17
• Weakness: CWE-284

Description

Improper Access Control in GitHub repository zulip/zulip prior to 4.10.

Affected products

• zulip: before 4.10 — fixed in 4.10

How to fix

Upgrade to a fixed version: zulip 4.10. Check the vendor advisory for mitigations.

References

• https://github.com/zulip/zulip/commit/d5db254ca8167995a1654d1c45ffc74b2fade39a
• https://huntr.dev/bounties/2928a625-0467-4a0a-b4e2-e27322786686
• https://github.com/zulip/zulip/commit/d5db254ca8167995a1654d1c45ffc74b2fade39a
• https://huntr.dev/bounties/2928a625-0467-4a0a-b4e2-e27322786686

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