{"cve":"CVE-2026-32308","nvd":{"published":"2026-03-13T19:54:42.147","modified":"2026-10-07T08:10:00.200","status":"Analyzed","description":"OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: \"loose\" and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid's click directive which can execute arbitrary JavaScript. Any field that renders markdown (incident descriptions, status page announcements, monitor notes) is vulnerable. This vulnerability is fixed in 10.0.23.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","score":7.6},"cwes":["CWE-79"],"references":["https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh"],"products":["hackerbay:oneuptime"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-32308","score":0.00228,"percentile":0.13421,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wvh5-6vjm-23qh","url":"https://osv.dev/vulnerability/GHSA-wvh5-6vjm-23qh","summary":"OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: \"loose\")","modified":"2026-03-16T17:16:23.319084Z","packages":[{"ecosystem":"npm","name":"oneuptime","purl":"pkg:npm/oneuptime","ranges":["<10.0.23"],"fixed":["10.0.23"]}]}],"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."]}