{"cve":"CVE-2021-27671","nvd":{"published":"2021-02-25T01:15:13.243","modified":"2026-06-17T03:45:19.750","status":"Modified","description":"An issue was discovered in the comrak crate before 0.9.1 for Rust. XSS can occur because the protection mechanism for data: and javascript: URIs is case-sensitive, allowing (for example) Data: to be used in an attack.","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://rustsec.org/advisories/RUSTSEC-2021-0026.html","https://rustsec.org/advisories/RUSTSEC-2021-0026.html"],"products":["comrak_project:comrak"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-27671","score":0.00686,"percentile":0.52667,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xmr7-v725-2jjr","url":"https://osv.dev/vulnerability/GHSA-xmr7-v725-2jjr","summary":"Cross site scripting in comrak","modified":"2023-11-08T04:05:25.341735Z","packages":[{"ecosystem":"crates.io","name":"comrak","purl":"pkg:cargo/comrak","ranges":["<0.9.1"],"fixed":["0.9.1"]}]},{"id":"RUSTSEC-2021-0026","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0026","summary":"XSS in `comrak`","modified":"2023-11-08T04:05:25.341735Z","packages":[{"ecosystem":"crates.io","name":"comrak","purl":"pkg:cargo/comrak","ranges":[">=0.0.0-0 <0.9.1"],"fixed":["0.9.1"]}]}],"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."]}