CVE-2026-126814— blueprintUE Self-Hosted Edition before 4.3.6 Arbitrary Iframe Embedding via PeerTube Matcher

Quick assessment

Affected

blueprintue blueprintue-self-hosted-edition

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BlueprintUE 自托管版本 4.3.6 之前存在 iframe 注入漏洞。该漏洞允许已认证用户通过滥用中的 PeerTube 视频 URL 匹配器，嵌入任意第三方内容。攻击者可在其控制的服务器上设置蓝图视频 URL，导致在用户同意后将该 URL 加载到无沙箱的 iframe 中，从而展示伪造的登录表单或触发恶意软件下载。

CVSS 3.5 · Low Updated Nov 12, 2026

Possible ATT&CK Techniques 2 AI

T1566 · Phishing T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

blueprintUE Self-Hosted Edition before 4.3.6 Arbitrary Iframe Embedding via PeerTube Matcher

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

从非可信控制范围包含功能例程

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
blueprintue	blueprintue-self-hosted-edition	1.0.0 ~ 4.3.6	-

II. Public POCs for CVE-2026-126814

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-126814

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Other References for CVE-2026-126814 (6)

https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/5f13e2bb8cd4c620899e9f8afd41a6e62b3bc6a4 patch
https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.5/app/services/www/BlueprintService.php#L700-L716 technical-description
https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/269 issue-tracking patch
https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-3vgc-fcfg-v233 vendor-advisory
https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.6 release-notes
https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.6-arbitrary-iframe-embedding-via-peertube-matcher third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-126814

Same Patch Batch · blueprintue · 2026-11-11 · 3 CVEs total

CVE-2026-126812	9.8 CRITICAL	blueprintUE Self-Hosted Edition before 4.3.7 Empty MariaDB Root Password via Docker Compos
CVE-2026-126659	7.5 HIGH	BlueprintUE Self-Hosted Edition 1.0.0 before 4.3.5 Storage Exhaustion via Anonymous Bluepr

IV. Related Vulnerabilities

Same product: blueprintue-self-hosted-edition

Same vendor: blueprintue

Same weakness: CWE-829