CVE-2026-55198

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 an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers.

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_commit, github_pr, github_release.
github_pr

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

Upstream fix in progress (PR #3991 · nesquena/hermes-webui, state=closed)

https://github.com/nesquena/hermes-webui/pull/3991
generic

Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hermes-webui-cross-profile-session-data-exfiltration-via-session-export-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-2026-55198(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 26× in last 7d / 72× 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 05:44 UTCEG score recompute
  2. 2026-07-07 05:44 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 06:28 UTCEG score recompute
  6. 2026-07-06 06:28 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 07:15 UTCEG score recompute
  10. 2026-07-05 07:14 UTCGHSA enrichment
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 07:53 UTCEG score recompute
  14. 2026-07-04 07:53 UTCGHSA enrichment
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-03 07:07 UTCEG score recompute
  18. 2026-07-03 07:07 UTCGHSA enrichment
  19. 2026-07-02 07:55 UTCEG score recompute
  20. 2026-07-02 07:55 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-07-01 08:44 UTCEG score recompute
  23. 2026-07-01 08:44 UTCGHSA enrichment
  24. 2026-06-30 23:22 UTCEPSS rescore
  25. 2026-06-30 09:32 UTCEG score recompute
Show 47 more
  1. 2026-06-30 09:32 UTCGHSA enrichment
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 10:19 UTCEG score recompute
  5. 2026-06-29 10:19 UTCGHSA enrichment
  6. 2026-06-28 14:07 UTCEPSS rescore
  7. 2026-06-28 11:07 UTCEG score recompute
  8. 2026-06-28 11:07 UTCGHSA enrichment
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 11:56 UTCEG score recompute
  12. 2026-06-27 11:56 UTCGHSA enrichment
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-26 12:45 UTCEG score recompute
  15. 2026-06-26 12:44 UTCGHSA enrichment
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-25 13:33 UTCEG score recompute
  18. 2026-06-25 13:33 UTCGHSA enrichment
  19. 2026-06-24 14:21 UTCEG score recompute
  20. 2026-06-24 14:21 UTCGHSA enrichment
  21. 2026-06-24 14:05 UTCEPSS rescore
  22. 2026-06-23 21:33 UTCEPSS rescore
  23. 2026-06-23 21:33 UTCEPSS rescore
  24. 2026-06-23 15:10 UTCEG score recompute
  25. 2026-06-23 15:10 UTCGHSA enrichment
  26. 2026-06-22 15:57 UTCEG score recompute
  27. 2026-06-22 15:57 UTCGHSA enrichment
  28. 2026-06-22 14:25 UTCEPSS rescore
  29. 2026-06-22 14:25 UTCEPSS rescore
  30. 2026-06-21 16:42 UTCEG score recompute
  31. 2026-06-21 16:42 UTCGHSA enrichment
  32. 2026-06-21 14:56 UTCEPSS rescore
  33. 2026-06-21 14:56 UTCEPSS rescore
  34. 2026-06-21 01:59 UTCEPSS rescore
  35. 2026-06-21 01:59 UTCEPSS rescore
  36. 2026-06-20 17:31 UTCEG score recompute
  37. 2026-06-20 17:30 UTCGHSA enrichment
  38. 2026-06-19 19:26 UTCEPSS rescore
  39. 2026-06-19 19:26 UTCEPSS rescore
  40. 2026-06-19 18:17 UTCEG score recompute
  41. 2026-06-19 18:17 UTCGHSA enrichment
  42. 2026-06-18 19:03 UTCEG score recompute
  43. 2026-06-18 19:03 UTCGHSA enrichment
  44. 2026-06-18 17:52 UTCEPSS rescore
  45. 2026-06-18 17:52 UTCEPSS rescore
  46. 2026-06-17 19:51 UTCEG score recompute
  47. 2026-06-17 19:50 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-55198?
CVE-2026-55198 is a medium vulnerability published on June 17, 2026. Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The handlesession_export handler in api/routes.py fails to verify active-profile ownership before serializing session…
When was CVE-2026-55198 disclosed?
CVE-2026-55198 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-2026-55198 actively exploited?
CVE-2026-55198 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-2026-55198?
CVE-2026-55198 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-55198?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55198, 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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