CVE-2025-47930: zulip Auth Bypass — Fix

Description

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique works for creating private channels without permission, though such a process requires either the API or modifying the HTML, as we do mark the "private" radio button as disabled in such cases. Version 10.3 contains a patch.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
zulip	zulip	10.0 — 10.3

References

Advisories & Patches

https://github.com/zulip/zulip/commit/d2ff4bda4c3efa30fc3ab1f151255cfdbf370f78

Other References

https://github.com/zulip/zulip/security/advisories/GHSA-rqg7-xfqg-v7q5 https://zulip.com/help/configure-who-can-create-channels https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-10-3

Frequently Asked Questions

What is CVE-2025-47930? +

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique works for creating private channels without permission, though such a process requires either the API or modifying the HTML, as we do mark the "private" radio button as disabled in such cases. Version 10.3 contains a patch. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-47930? +

CVE-2025-47930 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-47930? +

CVE-2025-47930 affects products from zulip, specifically: zulip. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-47930? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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