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CVE-2026-8879

CVE-2026-8879

Published: Jun 3, 2026Updated: Jun 4, 2026 Sources: CVE List NVD
NVD MITRE
7.5CVSS
HIGH

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.

EPSS Score
0.1%
Top 83.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-829

Affected Products

securly
securly
Security Products / secure-gateway-vpn
Securly Chrome Extension
Securly
Security Products / secure-gateway-vpn
securlycommercialSecurity Productsaka securly chrome extension

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://kb.cert.org/vuls/id/595768
kb.cert.org

Timeline

Published
Jun 3, 2026
Last Updated
Jun 4, 2026
News mentions
1

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