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Vulnerability record · CVE-2023-32677 · published 19 May 2023

CVE-2023-32677: Zulip missing authorization vulnerability

Zulip · Zulip

Zulip is an open-source team collaboration tool with unique topic-based threading. Zulip administrators can configure Zulip to limit who can add users to streams, and separately to limit who can invite users to the organization. In Zulip Server 6.1 and below, the UI which allows a user to invite a new user also allows them to set the streams that the new user is invited to -- even if the inviting user would not have permissions to add an existing user to streams. While such a configuration is likely rare in practice, the behavior does violate security-related controls. This does not let a user invite new users to streams they cannot see, or would not be able to add users to if they had that general permission. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may limit sending of invitations down to users who also have the permission to add users to streams.

3.1 CVSS 3.1 Low EPSS 0.56% · top 55.4% CWE-862 · Missing authorization
3.1CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Zulip is an open-source team collaboration tool with unique topic-based threading. Zulip administrators can configure Zulip to limit who can add users to streams, and separately to limit who can invite users to the organization. In Zulip Server 6.1 and below, the UI which allows a user to invite a new user also allows them to set the streams that the new user is invited to -- even if the inviting user would not have permissions to add an existing user to streams. While such a configuration is likely rare in practice, the behavior does violate security-related controls. This does not let a user invite new users to streams they cannot see, or would not be able to add users to if they had that general permission. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may limit sending of invitations down to users who also have the permission to add users to streams.

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

Affected products

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

References

LinkTags
https://github.com/zulip/zulip/commit/7c2693a2c64904d1d0af8503b57763943648cbe5 PatchThird Party Advisory
https://github.com/zulip/zulip/security/advisories/GHSA-mrvp-96q6-jpvc Third Party Advisory
https://zulip.com/help/configure-who-can-invite-to-streams Product
https://zulip.com/help/restrict-account-creation#change-who-can-send-invitations Product
https://github.com/zulip/zulip/commit/7c2693a2c64904d1d0af8503b57763943648cbe5 PatchThird Party Advisory
https://github.com/zulip/zulip/security/advisories/GHSA-mrvp-96q6-jpvc Third Party Advisory
https://zulip.com/help/configure-who-can-invite-to-streams Product
https://zulip.com/help/restrict-account-creation#change-who-can-send-invitations Product

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

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Source: NIST National Vulnerability Database (record CVE-2023-32677), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.