What is CVE-2017-0910?

CVE-2017-0910 is a high-severity vulnerability in Zulip Server, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2017-11-27.

How severe is CVE-2017-0910?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Zulip Server

CVE-2017-0910

In Zulip Server before 1.7.1, on a server with multiple realms, a vulnerability in the invitation system lets an authorized user of one realm on the server create a user account on any other realm.

Vulnerability class: Broken Access Control

Published 2017-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.0th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Zulip Server — versions before 1.7.1
Zulip Server

Weakness classification (CWE)

References

github.com/zulip/zulip/commit/960d736e55cbb9386a68e4ee45f80581fd2a4e32 (Patch, Third Party Advisory)
blog.zulip.org/2017/11/23/zulip-1-7-1-released/ (Vendor Advisory)

Frequently asked questions

What is CVE-2017-0910?: CVE-2017-0910 is a high-severity vulnerability in Zulip Server, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2017-11-27.
How severe is CVE-2017-0910?: High severity. CVSS v3 base score is 8.8 out of 10.