What is CVE-2019-19866?

CVE-2019-19866 is a high-severity vulnerability in Atos Unify Openscape Uc Web Client, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2020-02-21.

How severe is CVE-2019-19866?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Atos Unify Openscape Uc Web Client

CVE-2019-19866

Atos Unify OpenScape UC Web Client V9 before version V9 R4.31.0 and V10 before version V10 R0.6.0 allows remote attackers to obtain sensitive information. By iterating the value of conferenceId to getMailFunction in the JSON API, one can enumerate all conferences scheduled on the platform, with their numbers and access PINs.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2020-02-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.019 (79.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Atos Unify Openscape Uc Web Client — versions 9.0, 10.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

unify.com/en/support/security-advisories (Vendor Advisory)
networks.unify.com/security/advisories/OBSO-2002-01.pdf (Vendor Advisory)

Frequently asked questions

What is CVE-2019-19866?: CVE-2019-19866 is a high-severity vulnerability in Atos Unify Openscape Uc Web Client, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2020-02-21.
How severe is CVE-2019-19866?: High severity. CVSS v3 base score is 7.5 out of 10.