Auth bypass in Zulip
CVE-2026-115474
Zulip is an open-source team collaboration tool. From 8.0 until 12.2, in organizations where the Who can view all other users in the organization setting restricted guests from viewing other users, saving or editing a direct message draft did not verify that the sender could access the draft recipients. A guest could thereby gain access to otherwise restricted users' profile information without sending a message. Organizations that did not restrict guest access were unaffected. This issue is fixed in version 12.2.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Zulip — versions >= 8.0, < 12.2
Weakness classification (CWE)
References
- https://github.com/zulip/zulip/commit/1127d4cd3cc17a3cc38435ce57ed52b083c33f97
- https://github.com/zulip/zulip/commit/83a4a3a966e6eef11914b80f04426ae114a1970d
- https://github.com/zulip/zulip/pull/39913
- https://github.com/zulip/zulip/releases/tag/12.2
- https://github.com/zulip/zulip/security/advisories/GHSA-vwqp-7j32-xfg5
- https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2
Frequently asked questions
- What is CVE-2026-115474?
- CVE-2026-115474 is a medium-severity vulnerability in Zulip, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-11-04.
- How severe is CVE-2026-115474?
- Medium severity. CVSS v3 base score is 6.5 out of 10.