Cross-organization access via unchecked invitation realm
Published Feb 25, 2022 · Updated Apr 23, 2025
Authorization bypass in Zulip Server 2.0.0 through 4.9 allows remote attackers to join another organization through a reusable invite. The accounts_home_from_multiuse_invite and maybe_send_to_registration paths accepted a multi-use invite without matching its realm to the requested realm. A deployment must host multiple organizations, and possession of an invite from one organization is enough to bypass invitation or email-domain controls and inherit its assigned role in another.
Summary
What happened
Authorization bypass in Zulip Server 2.0.0 through 4.9 allows remote attackers to join another organization through a reusable invite. The accounts_home_from_multiuse_invite and maybe_send_to_registration paths accepted a multi-use invite without matching its realm to the requested realm. A deployment must host multiple organizations, and possession of an invite from one organization is enough to bypass invitation or email-domain controls and inherit its assigned role in another.
The record
- CVE
- CVE-2022-21706
- Published
- Feb 25, 2022
- Updated
- Apr 23, 2025
- Vendor
- Zulip
- Product
- Zulip
- Classifications
- CWE-863, CWE-284, T1136
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 25, 2022CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.0.0, < 4.10
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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