CVE-2026-59804

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-08. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: Elevated riskExposed: 0

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

Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
47(Track*)
EG Risk 47/100SSVC: Track*

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
Severity68% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket | Advisories | VulnCheck

https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket
github_pr

fix(web-integration): secure bridge server with Origin-based access control

Fix merged in web-infra-dev/midscene PR #2759 on 2026-07-07 — awaiting tagged release

https://github.com/web-infra-dev/midscene/pull/2759
generic

Bridge Server accepts cross-origin WebSocket connections - unauthenticated session hijack and DoS · Issue #2752 · web-infra-dev/midscene · GitHub

https://github.com/web-infra-dev/midscene/issues/2752
github_commit

commit 86f4118d1d84 (web-infra-dev/midscene)

Fix landed in web-infra-dev/midscene commit 86f4118d1d84 — awaiting tagged release

https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882

Vendor Advisories for CVE-2026-59804(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 85× 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 127 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59804?
CVE-2026-59804 is a medium vulnerability published on July 8, 2026. Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which…
When was CVE-2026-59804 disclosed?
CVE-2026-59804 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59804 actively exploited?
CVE-2026-59804 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.1% of all scored CVEs.
What is the CVSS score of CVE-2026-59804?
CVE-2026-59804 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-59804?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59804, 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

Explore the affected products and dependency analysis for CVE-2026-59804

Explore →

Is Your Infrastructure Affected by CVE-2026-59804?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs