What’s Vulnerable › Vulnerabilities

CVE-2021-28833

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-21 · updated 2026-06-17
• Weakness: CWE-79

Description

Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.

Affected products

• Increments Qiita::Markdown: before 0.34.0 — fixed in 0.34.0

How to fix

Upgrade to a fixed version: Increments Qiita::Markdown 0.34.0. Check the vendor advisory for mitigations.

References

• https://github.com/increments/qiita-markdown/releases
• https://vuln.ryotak.me/advisories/50
• https://github.com/increments/qiita-markdown/releases
• https://vuln.ryotak.me/advisories/50

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