CVE-2026-56277

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-01. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

Published

July 1, 2026

Last Modified

July 6, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
Patch available. Sources: github.
generic

Flowise - Hardcoded CORS Wildcard in TTS Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint
githubMentions a patch (unverified)

Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage · Advisory · FlowiseAI/Flowise · GitHub

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg

Vendor Advisories for CVE-2026-56277(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
flowise—
  • every version up to 3.1.2: fixed in 3.1.2
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 195 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-02 17:56 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-29 15:22 UTCEPSS rescore
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-24 14:04 UTCEPSS rescore
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 06:59 UTCEG score recompute
  18. 2026-09-23 06:59 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 06:38 UTCEG score recompute
  22. 2026-09-18 06:38 UTCGHSA enrichment
  23. 2026-09-17 19:31 UTCEPSS rescore
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-13 14:05 UTCEG score recompute
  4. 2026-09-13 14:05 UTCGHSA enrichment
  5. 2026-09-12 14:53 UTCEG score recompute
  6. 2026-09-12 14:53 UTCGHSA enrichment
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-06 04:59 UTCEG score recompute
  13. 2026-09-06 04:59 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 13:45 UTCEG score recompute
  20. 2026-08-30 13:45 UTCGHSA enrichment
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 22:31 UTCEG score recompute
  24. 2026-08-27 22:31 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
  26. 2026-08-26 14:46 UTCEPSS rescore
  27. 2026-08-25 13:49 UTCEPSS rescore
  28. 2026-08-25 05:49 UTCEG score recompute
  29. 2026-08-25 05:49 UTCGHSA enrichment
  30. 2026-08-24 06:36 UTCGHSA enrichment
  31. 2026-08-23 06:44 UTCEG score recompute
  32. 2026-08-23 06:43 UTCGHSA enrichment
  33. 2026-08-23 00:19 UTCEPSS rescore
  34. 2026-08-22 07:31 UTCEG score recompute
  35. 2026-08-22 07:31 UTCGHSA enrichment
  36. 2026-08-21 23:49 UTCEPSS rescore
  37. 2026-08-21 04:41 UTCEG score recompute
  38. 2026-08-21 04:41 UTCGHSA enrichment
  39. 2026-08-20 22:55 UTCEPSS rescore
  40. 2026-08-20 04:54 UTCEG score recompute
  41. 2026-08-20 04:54 UTCGHSA enrichment
  42. 2026-08-19 17:04 UTCEPSS rescore
  43. 2026-08-18 22:56 UTCEG score recompute
  44. 2026-08-18 22:55 UTCGHSA enrichment
  45. 2026-08-18 13:48 UTCEPSS rescore
  46. 2026-08-17 23:43 UTCEG score recompute
  47. 2026-08-17 23:42 UTCGHSA enrichment
  48. 2026-08-17 13:47 UTCEPSS rescore
  49. 2026-08-16 22:44 UTCEG score recompute
  50. 2026-08-16 22:44 UTCGHSA enrichment
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 02:14 UTCEPSS rescore
  53. 2026-08-15 23:32 UTCEG score recompute
  54. 2026-08-15 23:32 UTCGHSA enrichment
  55. 2026-08-15 01:30 UTCEPSS rescore
  56. 2026-08-15 00:19 UTCGHSA enrichment
  57. 2026-08-14 01:07 UTCEG score recompute
  58. 2026-08-14 01:07 UTCGHSA enrichment
  59. 2026-08-13 22:00 UTCEPSS rescore
  60. 2026-08-13 01:54 UTCEG score recompute
  61. 2026-08-13 01:54 UTCGHSA enrichment
  62. 2026-08-12 13:51 UTCEPSS rescore
  63. 2026-08-12 02:42 UTCEG score recompute
  64. 2026-08-12 02:42 UTCGHSA enrichment
  65. 2026-08-11 03:29 UTCEG score recompute
  66. 2026-08-11 03:29 UTCGHSA enrichment
  67. 2026-08-11 00:00 UTCEPSS rescore
  68. 2026-08-10 04:17 UTCEG score recompute
  69. 2026-08-10 04:17 UTCGHSA enrichment
  70. 2026-08-09 13:46 UTCEPSS rescore
  71. 2026-08-09 05:05 UTCEG score recompute
  72. 2026-08-09 05:05 UTCGHSA enrichment
  73. 2026-08-08 16:37 UTCEPSS rescore
  74. 2026-08-08 05:53 UTCEG score recompute
  75. 2026-08-08 05:53 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-56277?
CVE-2026-56277 is a medium vulnerability published on July 1, 2026. 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…
When was CVE-2026-56277 disclosed?
CVE-2026-56277 was first published on July 1, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56277 actively exploited?
CVE-2026-56277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56277?
CVE-2026-56277 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-56277?
A fix for CVE-2026-56277 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56277 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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