{"id":"CVE-2026-56277","aliases":["EUVD-2026-40432","GHSA-8m62-6r3h-3x25","GHSA-m837-xvxr-vqwg"],"status":"published","title":"Flowise - Hardcoded CORS Wildcard in TTS Endpoint","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.","severity":{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00179,"percentile":0.07584,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346","CWE-942"],"published":"2026-05-20T15:38:02Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"npm","package":"flowise","fixed_in":["3.1.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"flowise","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.1.1"},{"fixed":"3.1.2"}]}]},{"source":"osv","ecosystem":"npm","package":"flowise","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.2"}]}]}],"products":[{"vendor":"flowise","product":"flowise"},{"vendor":"flowiseai","product":"flowise"}],"references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg","tags":["vendor-advisory","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56277","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8m62-6r3h-3x25"},{"url":"https://github.com/advisories/GHSA-m837-xvxr-vqwg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56277.json","tags":["advisory"]},{"url":"https://github.com/FlowiseAI/Flowise","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-56277","title":"Flowise - Hardcoded CORS Wildcard in TTS Endpoint","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.","status":"published","published":"2026-06-30T22:08:27.269Z","modified":"2026-07-01T13:10:16.435Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T13:37:02.780526Z"}],"euvd":[{"id":"EUVD-2026-40432","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.","status":"published","published":"2026-06-30T22:08:27Z","modified":"2026-07-01T13:10:16Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"updated_at":"2026-11-02T18:20:20.297775Z"}],"ghsa":[{"id":"GHSA-8m62-6r3h-3x25","title":"Flowise before 3.1.2 sets Access-Control-Allow-Origin to a hardcoded wildcard (*) on its text-to...","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.","status":"published","published":"2026-07-01T00:34:13Z","modified":"2026-07-06T18:30:42Z","cvss":[{"version":"4.0","score":6.9,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:09:17.527527Z"},{"id":"GHSA-m837-xvxr-vqwg","title":"Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage","description":"### Summary\n\nThe TTS generation endpoint sets `Access-Control-Allow-Origin: *` as a hardcoded response header, independent of the server's CORS configuration. This enables any webpage to make cross-origin requests to generate speech using stored credentials.\n\n### Root Cause\n\n```typescript\n// packages/server/src/controllers/text-to-speech/index.ts:83\nres.setHeader('Access-Control-Allow-Origin', '*')\nres.setHeader('Access-Control-Allow-Headers', 'Cache-Control')\n```\n\n### Impact\n\n- Cross-origin credential abuse — any webpage can trigger TTS using stored credentials\n- Bypasses the server's CORS policy (`getCorsOptions()`) which is otherwise restrictive by default\n- Combined with Finding 3 (TTS credential abuse), enables drive-by credential abuse via malicious webpages\n\n### Suggested Fix\n\nRemove the hardcoded CORS wildcard and let the server's CORS middleware handle the headers:\n\n```typescript\n// Remove these lines:\n// res.setHeader('Access-Control-Allow-Origin', '*')\n// res.setHeader('Access-Control-Allow-Headers', 'Cache-Control')\n```\n\n---\n\n## References\n\n- `packages/server/src/controllers/text-to-speech/index.ts` line 83","status":"published","published":"2026-05-20T15:38:02Z","modified":"2026-05-20T15:38:05Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-942"],"updated_at":"2026-11-02T14:40:13.628377Z"}],"nvd":[{"id":"CVE-2026-56277","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.","status":"published","published":"2026-06-30T23:17:29.49Z","modified":"2026-07-06T15:49:06.113Z","cvss":[{"version":"4.0","score":6.9,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:26.866638Z"}],"osv":[{"id":"CVE-2026-56277","title":"Flowise - Hardcoded CORS Wildcard in TTS Endpoint","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.","status":"published","published":"2026-06-30T22:08:27.269Z","modified":"2026-10-28T02:31:02.577556168Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:45:11.609219Z"},{"id":"GHSA-m837-xvxr-vqwg","title":"Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage","description":"### Summary\n\nThe TTS generation endpoint sets `Access-Control-Allow-Origin: *` as a hardcoded response header, independent of the server's CORS configuration. This enables any webpage to make cross-origin requests to generate speech using stored credentials.\n\n### Root Cause\n\n```typescript\n// packages/server/src/controllers/text-to-speech/index.ts:83\nres.setHeader('Access-Control-Allow-Origin', '*')\nres.setHeader('Access-Control-Allow-Headers', 'Cache-Control')\n```\n\n### Impact\n\n- Cross-origin credential abuse — any webpage can trigger TTS using stored credentials\n- Bypasses the server's CORS policy (`getCorsOptions()`) which is otherwise restrictive by default\n- Combined with Finding 3 (TTS credential abuse), enables drive-by credential abuse via malicious webpages\n\n### Suggested Fix\n\nRemove the hardcoded CORS wildcard and let the server's CORS middleware handle the headers:\n\n```typescript\n// Remove these lines:\n// res.setHeader('Access-Control-Allow-Origin', '*')\n// res.setHeader('Access-Control-Allow-Headers', 'Cache-Control')\n```\n\n---\n\n## References\n\n- `packages/server/src/controllers/text-to-speech/index.ts` line 83","status":"published","published":"2026-05-20T15:38:02Z","modified":"2026-07-08T08:27:17.428824259Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-942"],"updated_at":"2026-11-02T15:46:51.463834Z"}]}}