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: 0.3%CVSS: 6.8Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

October 8, 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 11× in last 7d / 45× 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 192 total refreshes for this CVE.

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

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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 on July 8, 2026, with the most recent update on October 8, 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 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59804?
CVE-2026-59804 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59804?
An upstream fix for CVE-2026-59804 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-59804 are linked in the Vendor Advisories panel on this page.

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