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 — 4 sources updated this week
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.

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)
EPSS
35.1%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 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 23× in last 7d / 23× 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 21:14 UTCEG score recompute
  2. 2026-07-06 21:14 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 21:27 UTCEG score recompute
  8. 2026-07-05 21:26 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 21:40 UTCEG score recompute
  12. 2026-07-04 21:40 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 21:54 UTCEG score recompute
  16. 2026-07-03 21:54 UTCGHSA enrichment
  17. 2026-07-02 22:07 UTCEG score recompute
  18. 2026-07-02 22:07 UTCGHSA enrichment
  19. 2026-07-01 22:21 UTCEG score recompute
  20. 2026-07-01 22:20 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 22:34 UTCEG score recompute
  23. 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 2, 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 35.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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