{"cve":"CVE-2021-28833","nvd":{"published":"2021-06-21T13:15:08.083","modified":"2026-06-17T03:46:57.693","status":"Modified","description":"Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"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"],"products":["increments:qiita\\"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-28833","score":0.00739,"percentile":0.54572,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9p29-94hp-8rvc","url":"https://osv.dev/vulnerability/GHSA-9p29-94hp-8rvc","summary":"qiita-markdown Cross-site Scripting vulnerability","modified":"2023-11-08T04:05:31.748491Z","packages":[{"ecosystem":"RubyGems","name":"qiita-markdown","purl":"pkg:gem/qiita-markdown","ranges":["<0.34.0"],"fixed":["0.34.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}