CVE-2026-8879

CVE-2026-8879

Published Jun 3, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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 static security review. It runs on all URLs and immediately hides all page content, creates a full-page overlay, pauses all videos, and only restores content when the service worker confirms the page passes filtering. If Securly's servers are unreachable, pages remain indefinitely hidden.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
First Time appeared Securly securly Chrome Extension
Vendors & Products Securly securly Chrome Extension
Type Values Removed Values Added
First Time appeared Securly
Securly securly
CPEs cpe:2.3:a:securly:securly:3.0.7:*:*:*:*:chrome:*:*
Vendors & Products Securly
Securly securly
Type Values Removed Values Added
Weaknesses CWE-829
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-269
CWE-400
Type Values Removed Values Added
Description 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 static security review. It runs on all URLs and immediately hides all page content, creates a full-page overlay, pauses all videos, and only restores content when the service worker confirms the page passes filtering. If Securly's servers are unreachable, pages remain indefinitely hidden.
Title CVE-2026-8879
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Jun 4, 2026, 2:13 PM
Reserved
May 18, 2026, 8:29 PM
Status
Analyzed
Published
Jun 3, 2026, 7:16 PM
Modified
Jul 22, 2026, 8:10 PM