Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-66396

8.4 · HIGH

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute…

Published Jul 27, 2026CWE-79EPSS 0.54%

Overview

CVE-2026-66396 is a high-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34Refwww.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ialGitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66396?

CVE-2026-66396 is a high-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-66396?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-66396?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66396?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66396 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999