CVE-2026-55197

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH 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
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 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(high)
EPSS
19.0%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 23, 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 24× in last 7d / 70× 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. 2026-07-06 19:06 UTCEG score recompute
  2. 2026-07-06 19:06 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 18:22 UTCEG score recompute
  8. 2026-07-05 18:22 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 18:25 UTCEG score recompute
  12. 2026-07-04 18:25 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 18:28 UTCEG score recompute
  16. 2026-07-03 18:28 UTCGHSA enrichment
  17. 2026-07-02 18:35 UTCEG score recompute
  18. 2026-07-02 18:34 UTCGHSA enrichment
  19. 2026-07-01 18:41 UTCEG score recompute
  20. 2026-07-01 18:41 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 18:48 UTCEG score recompute
  24. 2026-06-30 18:48 UTCGHSA enrichment
  25. 2026-06-29 18:55 UTCEG score recompute
Show 45 more
  1. 2026-06-29 18:55 UTCGHSA enrichment
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-28 19:02 UTCEG score recompute
  5. 2026-06-28 19:02 UTCGHSA enrichment
  6. 2026-06-28 14:07 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-27 19:09 UTCEG score recompute
  10. 2026-06-27 19:09 UTCGHSA enrichment
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 19:15 UTCEG score recompute
  13. 2026-06-26 19:15 UTCGHSA enrichment
  14. 2026-06-25 19:22 UTCEG score recompute
  15. 2026-06-25 19:22 UTCGHSA enrichment
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-24 19:29 UTCEG score recompute
  18. 2026-06-24 19:28 UTCGHSA enrichment
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-23 19:24 UTCEG score recompute
  23. 2026-06-23 19:24 UTCGHSA enrichment
  24. 2026-06-22 19:30 UTCEG score recompute
  25. 2026-06-22 19:30 UTCGHSA enrichment
  26. 2026-06-22 14:25 UTCEPSS rescore
  27. 2026-06-22 14:25 UTCEPSS rescore
  28. 2026-06-21 19:35 UTCEG score recompute
  29. 2026-06-21 19:34 UTCGHSA enrichment
  30. 2026-06-21 14:56 UTCEPSS rescore
  31. 2026-06-21 14:56 UTCEPSS rescore
  32. 2026-06-21 01:59 UTCEPSS rescore
  33. 2026-06-21 01:59 UTCEPSS rescore
  34. 2026-06-20 19:40 UTCEG score recompute
  35. 2026-06-20 19:40 UTCGHSA enrichment
  36. 2026-06-19 19:39 UTCEG score recompute
  37. 2026-06-19 19:39 UTCGHSA enrichment
  38. 2026-06-19 19:26 UTCEPSS rescore
  39. 2026-06-19 19:26 UTCEPSS rescore
  40. 2026-06-18 19:45 UTCEG score recompute
  41. 2026-06-18 19:45 UTCGHSA enrichment
  42. 2026-06-18 17:52 UTCEPSS rescore
  43. 2026-06-18 17:52 UTCEPSS rescore
  44. 2026-06-17 19:51 UTCEG score recompute
  45. 2026-06-17 19:50 UTCNVD updatefirst tracked

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 June 23, 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 19.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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