CVE-2026-58446

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-07-01. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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.

Presenton before 0.8.8-beta bundles an MCP server that, on server/Docker deployments configured with session authentication (AUTH_USERNAME/AUTH_PASSWORD), is reachable unauthenticated at /mcp because the nginx front-end does not apply the auth_request gate to that path and the MCP server auto-mints a valid internal session token for the configured user. A remote unauthenticated attacker can invoke MCP tools such as generate_presentation, performing authenticated application actions, consuming the operators configured LLM API keys, and creating presentations in the operators instance. The Electron desktop build is not affected (MCP disabled).

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
60(Attend)
EG Risk 60/100SSVC: Attend

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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jun 30, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

Presenton < 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint
github_release Patch Available

electron-v0.8.8-beta

Patch available: presenton/presenton electron-v0.8.8-beta

https://github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta
github_pr Patch Available

feat: implement MCP authentication and update OpenAPI specifications

Patch available: presenton/presenton electron-v0.8.8-beta (PR #679 merged 2026-06-17)

https://github.com/presenton/presenton/pull/679
generic

[Bug]: Unauthenticated MCP Endpoint Bypasses Session Authentication via Internal Token Injection · Issue #678 · presenton/presenton · GitHub

https://github.com/presenton/presenton/issues/678
github_commit Patch Available

commit a1103dcef3c7 (presenton/presenton)

Patch available: presenton/presenton electron-v0.8.8-beta (contains commit a1103dcef3c7)

https://github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7

Vendor Advisories for CVE-2026-58446(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 18× in last 7d / 67× 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. 2026-07-27 16:47 UTCEG score recompute
  2. 2026-07-27 16:47 UTCGHSA enrichment
  3. 2026-07-27 14:14 UTCEPSS rescore
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 13:49 UTCEG score recompute
  7. 2026-07-26 13:49 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:21 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-21 15:25 UTCEPSS rescore
  19. 2026-07-20 17:08 UTCEPSS rescore
  20. 2026-07-19 14:31 UTCEPSS rescore
  21. 2026-07-19 14:31 UTCEPSS rescore
  22. 2026-07-19 02:29 UTCEPSS rescore
  23. 2026-07-18 10:04 UTCEPSS rescore
  24. 2026-07-16 18:58 UTCGHSA enrichment
  25. 2026-07-16 17:03 UTCEPSS rescore
Show 42 more
  1. 2026-07-15 19:12 UTCGHSA enrichment
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 19:25 UTCGHSA enrichment
  7. 2026-07-13 22:31 UTCEPSS rescore
  8. 2026-07-13 19:38 UTCGHSA enrichment
  9. 2026-07-13 06:13 UTCEPSS rescore
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-12 19:52 UTCGHSA enrichment
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-11 20:06 UTCGHSA enrichment
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-10 20:20 UTCGHSA enrichment
  17. 2026-07-09 20:33 UTCGHSA enrichment
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-08 20:47 UTCGHSA enrichment
  21. 2026-07-08 15:16 UTCEPSS rescore
  22. 2026-07-08 15:16 UTCEPSS rescore
  23. 2026-07-07 21:00 UTCGHSA enrichment
  24. 2026-07-07 13:46 UTCEPSS rescore
  25. 2026-07-07 13:46 UTCEPSS rescore
  26. 2026-07-06 21:14 UTCGHSA enrichment
  27. 2026-07-06 16:27 UTCEPSS rescore
  28. 2026-07-06 16:27 UTCEPSS rescore
  29. 2026-07-06 02:23 UTCEPSS rescore
  30. 2026-07-06 02:23 UTCEPSS rescore
  31. 2026-07-05 21:26 UTCGHSA enrichment
  32. 2026-07-05 02:31 UTCEPSS rescore
  33. 2026-07-05 02:30 UTCEPSS rescore
  34. 2026-07-04 21:40 UTCGHSA enrichment
  35. 2026-07-04 06:31 UTCEPSS rescore
  36. 2026-07-04 06:31 UTCEPSS rescore
  37. 2026-07-03 21:54 UTCGHSA enrichment
  38. 2026-07-02 22:07 UTCGHSA enrichment
  39. 2026-07-01 22:20 UTCGHSA enrichment
  40. 2026-07-01 15:07 UTCEPSS rescore
  41. 2026-06-30 22:34 UTCEG score recompute
  42. 2026-06-30 22:33 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-58446?
CVE-2026-58446 is a medium vulnerability published on June 30, 2026. Presenton before 0.8.8-beta bundles an MCP server that, on server/Docker deployments configured with session authentication (AUTHUSERNAME/AUTHPASSWORD), is reachable unauthenticated at /mcp because the nginx front-end does not apply the authrequest gate to that path and the MCP server auto-mints a…
When was CVE-2026-58446 disclosed?
CVE-2026-58446 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58446 actively exploited?
CVE-2026-58446 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 64.2% of all scored CVEs.
What is the CVSS score of CVE-2026-58446?
CVE-2026-58446 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-58446?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58446, 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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