Increments Qiita::Markdown before 0.33.0 allows XSS in transformers.
Priority LOW 29CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Increments Qiita::Markdown before 0.33.0 allows XSS in transformers.
Why it matters now
EPSS 0.00774 55th percentileScored 2026-11-07
Fix Fixed qiita-markdown (RubyGems): 0.33.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | qiita-markdown (RubyGems) | before 0.33.0 | 0.33.0 | Patch available | GHSA-f2c9-5jqw-3xh3 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- qiita-markdown (RubyGems) Vendor— Affected before 0.33.0 Fixed in 0.33.0 Patch available GHSA-f2c9-5jqw-3xh3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:increments:qiita\:\:markdown:*:*:*:*:*:*:*:* | markdown | Vulnerable | Increments |
- cpe:2.3:a:increments:qiita\:\:markdown:*:*:*:*:*:*:*:* Versions markdown Vulnerable ·Increments
Remediation
- Fix · GHSA-f2c9-5jqw-3xh3 qiita-markdown (RubyGems) Fixed in 0.33.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-28796
- 2026-10-03 Alias added: GHSA-f2c9-5jqw-3xh3
References
Advisory 3
More Increments Qiita vulnerabilities
- TI-2021-09824 Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different… CVSS 3.1MEDIUM 6.1
Sources
- CVE-2021-28796 · CVE Program
- CVE-2021-28796 · NVD
- FIRST EPSS
- GHSA-f2c9-5jqw-3xh3 · GitHub Advisory Database · CC BY 4.0
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