CVE-2026-126814
blueprintUE Self-Hosted Edition before 4.3.6 Arbitrary Iframe Embedding via PeerTube Matcher
CVSS Score
3.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-829 |
| Vendor | blueprintue |
| Product | blueprintue-self-hosted-edition |
| Published | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
blueprintue / blueprintue-self-hosted-edition
1.0.0 < 4.3.6
References
github.com: https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-3vgc-fcfg-v233 github.com: https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/5f13e2bb8cd4c620899e9f8afd41a6e62b3bc6a4 github.com: https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/269 github.com: https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.6 github.com: https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.5/app/services/www/BlueprintService.php#L700-L716 vulncheck.com: https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.6-arbitrary-iframe-embedding-via-peertube-matcher
Credits
Farhan Khan