CVE-2026-103758

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-10-01. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Obot 0.21.1 through 0.24.1 contains an authorization bypass vulnerability that allows authenticated users to reach MCP servers because the checkUI deny list omits the /mcp-connect-composite/ route. Basic-role users with a composite MCP ID can proxy requests through mcpGateway.Proxy to invoke tools on MCP servers restricted by Access Control Rules.

CVSS v3
8.1
EG Score
8.1HIGHhigh confidence
EG Risk
37
EG Risk 37/100CISA SSVC

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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 1, 2026

Last Modified

October 1, 2026

Advisory Details (2)

Auto-updated Oct 1, 2026
Patch available. Sources: github.
generic

Obot 0.21.1 through 0.24.1 Authorization Bypass via /mcp-connect-composite/ Route | Advisories | VulnCheck

https://www.vulncheck.com/advisories/obot-0.21.1-through-0.24.1-authorization-bypass-via-mcp-connect-composite-route
github Patch Available

UI-fallback deny list covers /mcp-connect/ but not /mcp-connect-composite/, reopening the GHSA-vw82 authorization bypass · Advisory · obot-platform/obot · GitHub

https://github.com/obot-platform/obot/security/advisories/GHSA-6fwv-3h4c-37j9

Vendor Advisories for CVE-2026-103758(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 17× in last 7d / 17× 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. 2026-10-04 09:39 UTCGHSA enrichment
  2. 2026-10-03 22:38 UTCEG score recompute
  3. 2026-10-03 22:38 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 11:39 UTCGHSA enrichment
  6. 2026-10-03 00:21 UTCEG score recompute
  7. 2026-10-03 00:21 UTCGHSA enrichment
  8. 2026-10-02 13:22 UTCGHSA enrichment
  9. 2026-10-02 02:23 UTCGHSA enrichment
  10. 2026-10-01 15:23 UTCGHSA enrichment
  11. 2026-10-01 15:12 UTCEG score recompute
  12. 2026-10-01 15:12 UTCGHSA enrichment
  13. 2026-10-01 14:42 UTCEG score recompute
  14. 2026-10-01 14:42 UTCGHSA enrichment
  15. 2026-10-01 11:26 UTCEG score recompute
  16. 2026-10-01 10:51 UTCEG score recompute
  17. 2026-10-01 10:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103758?
CVE-2026-103758 is a high vulnerability published on October 1, 2026. Obot 0.21.1 through 0.24.1 contains an authorization bypass vulnerability that allows authenticated users to reach MCP servers because the checkUI deny list omits the /mcp-connect-composite/ route. Basic-role users with a composite MCP ID can proxy requests through mcpGateway.Proxy to invoke tools…
When was CVE-2026-103758 disclosed?
CVE-2026-103758 was first published on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103758 actively exploited?
CVE-2026-103758 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103758?
CVE-2026-103758 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103758?
A fix for CVE-2026-103758 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103758 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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