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.
Published: 2026-06-03
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
History

Fri, 05 Jun 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Securly securly Chrome Extension
Vendors & Products Securly securly Chrome Extension

Thu, 04 Jun 2026 18:45:00 +0000

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

Thu, 04 Jun 2026 15:15:00 +0000

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'}


Wed, 03 Jun 2026 22:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
CWE-400

Wed, 03 Jun 2026 19:00:00 +0000

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

Subscriptions

Securly Securly Securly Chrome Extension
cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-06-04T14:13:20.892Z

Reserved: 2026-05-18T20:29:18.234Z

Link: CVE-2026-8879

cve-icon Vulnrichment

Updated: 2026-06-04T14:11:51.736Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-03T19:16:39.513

Modified: 2026-06-04T18:41:56.927

Link: CVE-2026-8879

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-05T10:11:25Z

Weaknesses