CVE-2026-56278

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-01. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secret ('flowise') for the express-session middleware when the EXPRESS_SESSION_SECRET environment variable is not set (packages/server/src/enterprise/middleware/passport/index.ts). Because this default secret is publicly visible in the source code, an attacker can forge valid signed session cookies to impersonate any user and bypass authentication.

CVSS v3
9.1
EG Score
9.1(high)
EPSS
29.9%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 6, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
Patch available. Sources: github.
generic

Flowise - Session Hijacking via Weak Default Express Session Secret | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret
github Patch Available

Weak Default Express Session Secret · Advisory · FlowiseAI/Flowise · GitHub

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh

Vendor Advisories for CVE-2026-56278(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 84× in last 7d / 84× 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.

  1. 2026-07-07 05:41 UTCEG score recompute
  2. 2026-07-07 05:41 UTCGHSA enrichment
  3. 2026-07-07 01:34 UTCEG score recompute
  4. 2026-07-07 01:34 UTCGHSA enrichment
  5. 2026-07-06 21:27 UTCEG score recompute
  6. 2026-07-06 21:26 UTCGHSA enrichment
  7. 2026-07-06 17:19 UTCEG score recompute
  8. 2026-07-06 17:18 UTCGHSA enrichment
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 13:11 UTCEG score recompute
  12. 2026-07-06 13:11 UTCGHSA enrichment
  13. 2026-07-06 09:00 UTCEG score recompute
  14. 2026-07-06 09:00 UTCGHSA enrichment
  15. 2026-07-06 04:46 UTCEG score recompute
  16. 2026-07-06 04:46 UTCGHSA enrichment
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-06 00:34 UTCEG score recompute
  20. 2026-07-06 00:33 UTCGHSA enrichment
  21. 2026-07-05 20:27 UTCEG score recompute
  22. 2026-07-05 20:27 UTCGHSA enrichment
  23. 2026-07-05 16:20 UTCEG score recompute
  24. 2026-07-05 16:20 UTCGHSA enrichment
  25. 2026-07-05 12:11 UTCEG score recompute
Show 59 more
  1. 2026-07-05 12:11 UTCGHSA enrichment
  2. 2026-07-05 08:05 UTCEG score recompute
  3. 2026-07-05 08:04 UTCGHSA enrichment
  4. 2026-07-05 03:58 UTCEG score recompute
  5. 2026-07-05 03:58 UTCGHSA enrichment
  6. 2026-07-05 02:31 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-04 23:50 UTCEG score recompute
  9. 2026-07-04 23:50 UTCGHSA enrichment
  10. 2026-07-04 19:45 UTCEG score recompute
  11. 2026-07-04 19:45 UTCGHSA enrichment
  12. 2026-07-04 15:39 UTCEG score recompute
  13. 2026-07-04 15:39 UTCGHSA enrichment
  14. 2026-07-04 11:32 UTCEG score recompute
  15. 2026-07-04 11:32 UTCGHSA enrichment
  16. 2026-07-04 07:26 UTCEG score recompute
  17. 2026-07-04 07:26 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 03:17 UTCEG score recompute
  21. 2026-07-04 03:17 UTCGHSA enrichment
  22. 2026-07-03 23:10 UTCEG score recompute
  23. 2026-07-03 23:10 UTCGHSA enrichment
  24. 2026-07-03 19:03 UTCEG score recompute
  25. 2026-07-03 19:03 UTCGHSA enrichment
  26. 2026-07-03 14:57 UTCEG score recompute
  27. 2026-07-03 14:57 UTCGHSA enrichment
  28. 2026-07-03 10:49 UTCEG score recompute
  29. 2026-07-03 10:49 UTCGHSA enrichment
  30. 2026-07-03 06:42 UTCEG score recompute
  31. 2026-07-03 06:42 UTCGHSA enrichment
  32. 2026-07-03 02:33 UTCEG score recompute
  33. 2026-07-03 02:33 UTCGHSA enrichment
  34. 2026-07-02 22:27 UTCEG score recompute
  35. 2026-07-02 22:27 UTCGHSA enrichment
  36. 2026-07-02 18:21 UTCEG score recompute
  37. 2026-07-02 18:21 UTCGHSA enrichment
  38. 2026-07-02 14:15 UTCEG score recompute
  39. 2026-07-02 14:15 UTCGHSA enrichment
  40. 2026-07-02 10:09 UTCEG score recompute
  41. 2026-07-02 10:09 UTCGHSA enrichment
  42. 2026-07-02 06:04 UTCEG score recompute
  43. 2026-07-02 06:03 UTCGHSA enrichment
  44. 2026-07-02 01:57 UTCEG score recompute
  45. 2026-07-02 01:57 UTCGHSA enrichment
  46. 2026-07-01 21:51 UTCEG score recompute
  47. 2026-07-01 21:51 UTCGHSA enrichment
  48. 2026-07-01 17:45 UTCEG score recompute
  49. 2026-07-01 17:45 UTCGHSA enrichment
  50. 2026-07-01 17:06 UTCNVD updateCVSS v4 → 9.3
  51. 2026-07-01 15:07 UTCEPSS rescore
  52. 2026-07-01 13:39 UTCEG score recompute
  53. 2026-07-01 13:39 UTCGHSA enrichment
  54. 2026-07-01 09:32 UTCEG score recompute
  55. 2026-07-01 09:32 UTCGHSA enrichment
  56. 2026-07-01 05:26 UTCEG score recompute
  57. 2026-07-01 05:26 UTCGHSA enrichment
  58. 2026-07-01 01:19 UTCEG score recompute
  59. 2026-07-01 01:19 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56278?
CVE-2026-56278 is a critical vulnerability published on July 1, 2026. Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secret ('flowise') for the express-session middleware when the EXPRESSSESSIONSECRET environment variable is not set (packages/server/src/enterprise/middleware/passport/index.ts). Because this default secret is…
When was CVE-2026-56278 disclosed?
CVE-2026-56278 was first published in the National Vulnerability Database 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-2026-56278 actively exploited?
CVE-2026-56278 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56278?
CVE-2026-56278 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-56278?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56278, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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