CVE-2026-79786

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Coroot's unauthenticated MCP OAuth dynamic client registration endpoint accepts any syntactically valid redirect URI without validation, allowing attackers to register clients pointing to attacker-controlled hosts. Attackers can send authorization URLs to signed-in users, capture their authorization codes upon consent approval, and exchange them for access tokens to hijack MCP sessions.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: Track

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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (4)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP OAuth Client Registration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/coroot-1.20.2-through-1.24.5-unvalidated-redirect-uri-in-mcp-oauth-client-registration
generic

coroot/api/mcp_oauth.go at v1.24.5 · coroot/coroot · GitHub

https://github.com/coroot/coroot/blob/v1.24.5/api/mcp_oauth.go
generic

Open Redirect via Unvalidated OAuth Redirect URI in MCP OAuth Flow · Issue #929 · coroot/coroot · GitHub

https://github.com/coroot/coroot/issues/929
generic

GitHub - coroot/coroot: Coroot is an open-source observability and APM tool with AI-powered Root Cause Analysis. It combines metrics, logs, traces, continuous profiling, and SLO-based alerting with predefined dashboards and inspections. · GitHub

https://github.com/coroot/coroot

Vendor Advisories for CVE-2026-79786(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 22× in last 7d / 22× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 22:33 UTCGHSA enrichment
  3. 2026-08-29 11:02 UTCGHSA enrichment
  4. 2026-08-28 23:28 UTCEG score recompute
  5. 2026-08-28 23:28 UTCGHSA enrichment
  6. 2026-08-28 22:51 UTCEG score recompute
  7. 2026-08-28 22:50 UTCGHSA enrichment
  8. 2026-08-28 21:42 UTCEPSS rescore
  9. 2026-08-28 17:27 UTCGHSA enrichment
  10. 2026-08-28 05:43 UTCGHSA enrichment
  11. 2026-08-27 18:11 UTCEG score recompute
  12. 2026-08-27 18:11 UTCGHSA enrichment
  13. 2026-08-27 14:25 UTCEPSS rescore
  14. 2026-08-27 05:57 UTCGHSA enrichment
  15. 2026-08-26 18:25 UTCEG score recompute
  16. 2026-08-26 18:25 UTCGHSA enrichment
  17. 2026-08-26 14:47 UTCEPSS rescore
  18. 2026-08-26 06:51 UTCEG score recompute
  19. 2026-08-26 06:51 UTCGHSA enrichment
  20. 2026-08-25 19:20 UTCEG score recompute
  21. 2026-08-25 18:30 UTCEG score recompute
  22. 2026-08-25 18:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-79786?
CVE-2026-79786 is a high vulnerability published on August 25, 2026. Coroot's unauthenticated MCP OAuth dynamic client registration endpoint accepts any syntactically valid redirect URI without validation, allowing attackers to register clients pointing to attacker-controlled hosts. Attackers can send authorization URLs to signed-in users, capture their…
When was CVE-2026-79786 disclosed?
CVE-2026-79786 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79786 actively exploited?
CVE-2026-79786 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 87.7% of all scored CVEs.
What is the CVSS score of CVE-2026-79786?
CVE-2026-79786 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-79786?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79786, 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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