CVE-2026-126814
Published:November 11, 2026
Updated:November 12, 2026
blueprintUE Self-Hosted Edition before 4.3.6 contains an iframe injection vulnerability that allows authenticated users to embed arbitrary third-party content by abusing the PeerTube video URL matcher in BlueprintService::findVideoProvider(). Attackers can set a blueprint video URL on an attacker-controlled host, which site.js loads in an unsandboxed iframe after consent, framing fake login forms or malware downloads.
Affected Packages
https://github.com/blueprintue/blueprintue-self-hosted-edition.git (GITHUB):
Affected version(s) >=v1.0.0 <v4.3.6 || >=v2.0.0 <v4.3.6 || >=v3.0.0 <v4.3.6 || >=v4.0.0 <v4.3.6Fix Suggestion:
Update to version v4.3.6Related Resources (8)
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Contact UsCVSS v4
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Inclusion of Functionality from Untrusted Control Sphere
EPSS
Base Score:
0.26