What’s Vulnerable › Vulnerabilities

CVE-2021-29272

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-27 · updated 2026-06-17
• Weakness: CWE-79

Description

bluemonday before 1.0.5 allows XSS because certain Go lowercasing converts an uppercase Cyrillic character, defeating a protection mechanism against the "script" string.

Affected products

• Microco Bluemonday: before 1.0.5 — fixed in 1.0.5

How to fix

Upgrade to a fixed version: Microco Bluemonday 1.0.5. Check the vendor advisory for mitigations.

References

• https://github.com/microcosm-cc/bluemonday/releases/tag/v1.0.5
• https://vuln.ryotak.me/advisories/4
• https://github.com/microcosm-cc/bluemonday/releases/tag/v1.0.5
• https://vuln.ryotak.me/advisories/4

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