What is CVE-2026-8879?

CVE-2026-8879 is a high-severity vulnerability in Securly, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.5/10. Published 2026-06-03.

How severe is CVE-2026-8879?

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

Vulnerability in Securly

CVE-2026-8879

Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts() at runtime. This script is NOT declared in manifest.json and bypasses Chrome Web Store s…

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

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:N/I:N/A:H.

Affected products

Securly — versions 3.0.7
Securly Chrome Extension — versions 0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cret@cert.org (Third Party Advisory)

Frequently asked questions

What is CVE-2026-8879?: CVE-2026-8879 is a high-severity vulnerability in Securly, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.5/10. Published 2026-06-03.
How severe is CVE-2026-8879?: High severity. CVSS v3 base score is 7.5 out of 10.