What is CVE-2019-9870?

CVE-2019-9870 is a critical-severity vulnerability in Oembed Project, classified under CWE-19. CVSS score: 9.8/10. Published 2019-03-21.

How severe is CVE-2019-9870?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Oembed Project

CVE-2019-9870

plugin.js in the w8tcha oEmbed plugin before 2019-03-14 for CKEditor mishandles SCRIPT elements.

Published 2019-03-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Oembed Project

Weakness classification (CWE)

CWE-19

References

github.com/w8tcha/CKEditor-oEmbed-Plugin/issues/94 (Third Party Advisory)
github.com/w8tcha/CKEditor-oEmbed-Plugin/commit/10f6169e39510bbf5af913886037044… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9870?: CVE-2019-9870 is a critical-severity vulnerability in Oembed Project, classified under CWE-19. CVSS score: 9.8/10. Published 2019-03-21.
How severe is CVE-2019-9870?: Critical severity. CVSS v3 base score is 9.8 out of 10.