CVE-2026-55197

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-17. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=&messages=1 to retrieve unauthorized conversation transcripts and metadata.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

June 17, 2026

Last Modified

September 17, 2026

Advisory Details (5)

Auto-updated Jun 17, 2026
Patch available. Sources: github_release, github_commit, github_pr.
github_pr

[security] fix(session): scope detail loads to active profile

Upstream fix in progress (PR #3982 · nesquena/hermes-webui, state=closed)

https://github.com/nesquena/hermes-webui/pull/3982
generic

Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint
github_release Patch Available

v0.51.443

Patch available: nesquena/hermes-webui v0.51.443

https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443
github_pr Patch Available

Release PD (v0.51.443): [security] scope session by-id reads + exports to active profile (#3982, #3991)

Patch available: nesquena/hermes-webui v0.51.452 (PR #4269 merged 2026-06-15)

https://github.com/nesquena/hermes-webui/pull/4269
github_commit Patch Available

commit 2a3baa71b81c (nesquena/hermes-webui)

Patch available: nesquena/hermes-webui v0.51.452 (contains commit 2a3baa71b81c)

https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71

Vendor Advisories for CVE-2026-55197(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 9× in last 7d / 34× 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 191 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-55197?
CVE-2026-55197 is a medium vulnerability published on June 17, 2026. Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET…
When was CVE-2026-55197 disclosed?
CVE-2026-55197 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55197 actively exploited?
CVE-2026-55197 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 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55197?
CVE-2026-55197 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-55197?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55197, 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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