What is CVE-2020-10858?

CVE-2020-10858 is a medium-severity vulnerability in Zulip Desktop, classified under Missing Authorization. CVSS score: 5.3/10. Published 2021-02-05.

How severe is CVE-2020-10858?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Zulip Desktop

CVE-2020-10858

Zulip Desktop before 5.0.0 allows attackers to perform recording via the webcam and microphone due to a missing permission request handler.

Vulnerability class: Broken Access Control

Published 2021-02-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.6% 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 Desktop

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

blog.zulip.com/2020/04/01/zulip-desktop-5-0-0-security-release/ (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-10858?: CVE-2020-10858 is a medium-severity vulnerability in Zulip Desktop, classified under Missing Authorization. CVSS score: 5.3/10. Published 2021-02-05.
How severe is CVE-2020-10858?: Medium severity. CVSS v3 base score is 5.3 out of 10.