Vulnerability details
CVE-2026-8879
Securly Chrome Extension
CVE-2026-8879
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Securly | Securly Chrome Extension | v ≤ 3.0.7 | CVEProject cvelistV5 (CNA) |
References and advisories
1
Kolun on Telegram @kolunsec
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Details
- Published
- 2026-06-03
- Last updated
- 2026-06-04
- State
- Published
- Assigner (CNA)
- certcc
Exploit prediction (EPSS)
0.37%
Probability of exploitation in 30 days
31.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-829Inclusion of Functionality from Untrusted Control Sphere