What is CVE-2026-25741?

CVE-2026-25741 is a high-severity vulnerability in Zulip, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-02-26.

How severe is CVE-2026-25741?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Zulip

CVE-2026-25741

Zulip is an open-source team collaboration tool. Prior to commit bf28c82dc9b1f630fa8e9106358771b20a0040f7, the API endpoint for creating a card update session during an upgrade flow was accessible to users with only organization member pri…

Vulnerability class: Broken Access Control

EPSS: 0.000 (4.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.

Affected products

Zulip — versions < bf28c82dc9b1f630fa8e9106358771b20a0040f7

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

https://github.com/zulip/zulip/security/advisories/GHSA-vhhx-84f7-rc8j (x_refsource_CONFIRM)
https://github.com/zulip/zulip/commit/bf28c82dc9b1f630fa8e9106358771b20a0040f7 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25741?: CVE-2026-25741 is a high-severity vulnerability in Zulip, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-02-26.
How severe is CVE-2026-25741?: High severity. CVSS v3 base score is 7.1 out of 10.