{"cve":"CVE-2026-56277","nvd":{"published":"2026-06-30T23:17:29.490","modified":"2026-07-06T15:49:06.113","status":"Analyzed","description":"Flowise before 3.1.2 sets Access-Control-Allow-Origin to a hardcoded wildcard (*) on its text-to-speech (TTS) generation endpoint (packages/server/src/controllers/text-to-speech/index.ts), independent of the server's configured CORS policy. This bypasses the server's otherwise restrictive default CORS configuration (getCorsOptions()) and allows any webpage to make cross-origin requests that trigger TTS generation using stored credentials, enabling drive-by cross-origin credential abuse.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5},"cwes":["CWE-346"],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg","https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint"],"products":["flowiseai:flowise"],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-56277","score":0.00179,"percentile":0.07495,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-m837-xvxr-vqwg","url":"https://osv.dev/vulnerability/GHSA-m837-xvxr-vqwg","summary":"Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage","modified":"2026-07-08T08:27:17.428824259Z","packages":[{"ecosystem":"npm","name":"flowise","purl":"pkg:npm/flowise","ranges":["<3.1.2"],"fixed":["3.1.2"]}]}],"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."]}