CVE-2026-8879
Last modified
CVE-2026-8879 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.37% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Securly | Securly | 3.0.7 |
References
- https://kb.cert.org/vuls/id/595768Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-8879?
How severe is CVE-2026-8879?
How do I fix CVE-2026-8879?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-8873The Content Slideshow plugin for WordPress is vulnerable to …6.4
- CVE-2026-8874Version 3.0.7 of the Securly Chrome Extension downloads JSON…7.1
- CVE-2026-8875The Easy Prism Syntax Highlighter plugin for WordPress is vu…6.4
- CVE-2026-8876Version 3.0.7 of the Securly Chrome Extension contains hardc…7.3
- CVE-2026-8877The Responsive Video Embedder plugin for WordPress is vulner…6.4
- CVE-2026-8878Version 3.0.7 of the Securly Chrome Extension exposes multip…7.5
- CVE-2026-8880The RomanCart Ecommerce plugin for WordPress is vulnerable t…6.4
- CVE-2026-8881Version 3.0.7 of the Securly Chrome Extension uses EVP_Bytes…7.5
- CVE-2026-8882The WP ApplicantStack Jobs Display plugin for WordPress is v…6.4
- CVE-2026-8883The Global Body Mass Index Calculator plugin for WordPress i…6.4
- CVE-2026-8884The Instant-Quote.co Quotation Page plugin for WordPress is …6.4
- CVE-2026-8885The DeMomentSomTres Shortcodes plugin for WordPress is vulne…6.4
Are you affected by CVE-2026-8879?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST