{"cve":"CVE-2026-79663","nvd":{"published":"2026-08-25T12:16:33.627","modified":"2026-08-31T20:38:54.340","status":"Deferred","description":"Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS readers that render HTML-type summaries, affecting anonymous subscribers and other users.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","score":4.8},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","score":4.8},"cwes":["CWE-79"],"references":["https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf","https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-names"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-79663","score":0.00251,"percentile":0.16657,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3v85-fqvh-7rxf","url":"https://osv.dev/vulnerability/GHSA-3v85-fqvh-7rxf","summary":"Ech0's RSS feed renders unescaped tag names and raw-HTML markdown, stored XSS against subscribers","modified":"2026-08-27T04:10:39.381391554Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/Ech0","purl":"pkg:golang/github.com/lin-snow/Ech0","ranges":["<1.4.8-0.20260503035519-fd320fe3e902"],"fixed":["1.4.8-0.20260503035519-fd320fe3e902"]}]},{"id":"GO-2026-5100","url":"https://osv.dev/vulnerability/GO-2026-5100","summary":"Ech0's RSS feed renders unescaped tag names and raw-HTML markdown, stored XSS against subscribers in github.com/lin-snow/ech0","modified":"2026-08-27T04:10:39.381391554Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<1.4.8-0.20260503035519-fd320fe3e902"],"fixed":["1.4.8-0.20260503035519-fd320fe3e902"]}]}],"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."]}