What’s Vulnerable › Vulnerabilities

CVE-2026-66300: SNOMED International Snowstorm reflected XSS

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-10-24
• Weakness: CWE-79

Description

SNOMED International Snowstorm contains a reflected XSS vulnerability within the "Web Route" redirection functionality. An attacker can inject arbitrary JavaScript which will execute upon a target user navigating to a crafted, malicious link. Fixed in 10.12.2 and 10.9.3.

Affected products

• SNOMED International Snowstorm: from 7.0.0 before 10.12.2 — fixed in 10.12.2

How to fix

Upgrade to a fixed version: SNOMED International Snowstorm 10.12.2. Check the vendor advisory for mitigations.

References

• https://github.com/IHTSDO/snowstorm/commit/575b555695811110dafe2fcea7dd2fd7e4bcee39
• https://github.com/IHTSDO/snowstorm/commit/b8061add427c930b3030549e77aa23ec5957ceb6
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-212-01.json
• https://www.cve.org/CVERecord?id=CVE-2026-66300

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