CVE-2026-56677

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-08-17. A secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.6Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

9Router is an AI router & token saver. In 0.5.4 and earlier, the POST /api/auth/oidc/test endpoint in src/app/api/auth/oidc/test/route.js passes the user-controlled issuerUrl parameter to fetchOidcDiscovery() in src/lib/auth/oidc.js without restricting private or loopback destinations, allowing unauthenticated attackers when dashboard login is disabled to scan internal services and reflect OIDC discovery fields including token_endpoint and jwks_uri.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA 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
Severity86% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

August 17, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint · Advisory · decolua/9router · GitHub

https://github.com/decolua/9router/security/advisories/GHSA-8g4w-4ffg-8vgx

Vendor Advisories for CVE-2026-56677(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npm9router—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
9router—
  • every version through 0.5.4: no fix on record
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 98× 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.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-10-05 11:51 UTCEG score recompute
  2. 2026-10-05 11:51 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 21:48 UTCGHSA enrichment
  5. 2026-10-04 06:46 UTCGHSA enrichment
  6. 2026-10-03 17:46 UTCEG score recompute
  7. 2026-10-03 17:46 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-02 15:44 UTCGHSA enrichment
  11. 2026-10-02 01:33 UTCEG score recompute
  12. 2026-10-02 01:33 UTCGHSA enrichment
  13. 2026-10-01 19:50 UTCEPSS rescore
  14. 2026-10-01 12:07 UTCGHSA enrichment
  15. 2026-09-30 22:57 UTCEG score recompute
  16. 2026-09-30 22:57 UTCGHSA enrichment
  17. 2026-09-30 15:03 UTCEPSS rescore
  18. 2026-09-30 09:58 UTCEG score recompute
  19. 2026-09-30 09:58 UTCGHSA enrichment
  20. 2026-09-29 15:22 UTCEPSS rescore
  21. 2026-09-28 23:58 UTCEG score recompute
  22. 2026-09-28 23:58 UTCGHSA enrichment
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-28 10:47 UTCGHSA enrichment
  25. 2026-09-27 21:38 UTCEG score recompute
Show 75 more
  1. 2026-09-27 21:38 UTCGHSA enrichment
  2. 2026-09-27 13:48 UTCEPSS rescore
  3. 2026-09-27 08:04 UTCEG score recompute
  4. 2026-09-27 08:04 UTCGHSA enrichment
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-25 01:58 UTCEG score recompute
  7. 2026-09-25 01:58 UTCGHSA enrichment
  8. 2026-09-24 14:04 UTCEPSS rescore
  9. 2026-09-24 11:37 UTCGHSA enrichment
  10. 2026-09-23 22:37 UTCEG score recompute
  11. 2026-09-23 22:37 UTCGHSA enrichment
  12. 2026-09-23 17:54 UTCEPSS rescore
  13. 2026-09-23 09:37 UTCGHSA enrichment
  14. 2026-09-22 20:38 UTCEG score recompute
  15. 2026-09-22 20:38 UTCGHSA enrichment
  16. 2026-09-22 07:37 UTCEG score recompute
  17. 2026-09-22 07:37 UTCGHSA enrichment
  18. 2026-09-21 18:37 UTCGHSA enrichment
  19. 2026-09-21 03:55 UTCEG score recompute
  20. 2026-09-21 03:55 UTCGHSA enrichment
  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-20 14:53 UTCGHSA enrichment
  23. 2026-09-20 01:53 UTCEG score recompute
  24. 2026-09-20 01:53 UTCGHSA enrichment
  25. 2026-09-19 12:54 UTCGHSA enrichment
  26. 2026-09-18 23:53 UTCEG score recompute
  27. 2026-09-18 23:53 UTCGHSA enrichment
  28. 2026-09-18 19:28 UTCEPSS rescore
  29. 2026-09-18 10:53 UTCGHSA enrichment
  30. 2026-09-17 21:53 UTCEG score recompute
  31. 2026-09-17 21:53 UTCGHSA enrichment
  32. 2026-09-17 19:31 UTCEPSS rescore
  33. 2026-09-17 03:44 UTCEG score recompute
  34. 2026-09-17 03:44 UTCGHSA enrichment
  35. 2026-09-16 14:08 UTCEPSS rescore
  36. 2026-09-16 13:46 UTCGHSA enrichment
  37. 2026-09-16 05:20 UTCEG score recompute
  38. 2026-09-16 05:20 UTCGHSA enrichment
  39. 2026-09-16 05:15 UTCEPSS rescore
  40. 2026-09-15 16:20 UTCGHSA enrichment
  41. 2026-09-15 03:20 UTCEG score recompute
  42. 2026-09-15 03:19 UTCGHSA enrichment
  43. 2026-09-15 03:11 UTCEPSS rescore
  44. 2026-09-14 14:19 UTCGHSA enrichment
  45. 2026-09-14 01:18 UTCEG score recompute
  46. 2026-09-14 01:18 UTCGHSA enrichment
  47. 2026-09-13 16:47 UTCEPSS rescore
  48. 2026-09-13 12:19 UTCGHSA enrichment
  49. 2026-09-12 23:19 UTCEG score recompute
  50. 2026-09-12 23:19 UTCGHSA enrichment
  51. 2026-09-12 10:19 UTCGHSA enrichment
  52. 2026-09-11 21:15 UTCEG score recompute
  53. 2026-09-11 21:15 UTCGHSA enrichment
  54. 2026-09-11 14:53 UTCEPSS rescore
  55. 2026-09-11 08:15 UTCGHSA enrichment
  56. 2026-09-10 19:16 UTCEG score recompute
  57. 2026-09-10 19:15 UTCGHSA enrichment
  58. 2026-09-10 09:35 UTCEPSS rescore
  59. 2026-09-10 06:15 UTCGHSA enrichment
  60. 2026-09-09 17:15 UTCGHSA enrichment
  61. 2026-09-09 03:36 UTCEG score recompute
  62. 2026-09-09 03:36 UTCGHSA enrichment
  63. 2026-09-08 22:01 UTCEPSS rescore
  64. 2026-09-08 06:41 UTCGHSA enrichment
  65. 2026-09-07 17:40 UTCEG score recompute
  66. 2026-09-07 17:40 UTCGHSA enrichment
  67. 2026-09-07 16:01 UTCEPSS rescore
  68. 2026-09-07 04:41 UTCEG score recompute
  69. 2026-09-07 04:41 UTCGHSA enrichment
  70. 2026-09-06 13:47 UTCEPSS rescore
  71. 2026-09-06 12:58 UTCGHSA enrichment
  72. 2026-09-05 23:58 UTCEG score recompute
  73. 2026-09-05 23:58 UTCGHSA enrichment
  74. 2026-09-05 10:59 UTCGHSA enrichment
  75. 2026-09-04 21:54 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-56677?
CVE-2026-56677 is a high vulnerability published on August 17, 2026. 9Router is an AI router & token saver. In 0.5.4 and earlier, the POST /api/auth/oidc/test endpoint in src/app/api/auth/oidc/test/route.js passes the user-controlled issuerUrl parameter to fetchOidcDiscovery() in src/lib/auth/oidc.js without restricting private or loopback destinations, allowing…
When was CVE-2026-56677 disclosed?
CVE-2026-56677 was first published on August 17, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56677 actively exploited?
CVE-2026-56677 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56677?
CVE-2026-56677 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56677?
A fix for CVE-2026-56677 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56677 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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