CVE-2026-20184

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-15. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service. This vulnerability existed because of improper certificate validation. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by connecting to a service endpoint and supplying a crafted token. A successful exploit could have allowed the attacker to gain unauthorized access to legitimate Cisco Webex services.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

April 15, 2026

Last Modified

April 17, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

Cisco Webex Services Certificate Validation Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-cui-cert-8jSZYhWL

Vendor Advisories for CVE-2026-20184(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 6× in last 7d / 40× 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 251 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 14:11 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 01:22 UTCEPSS rescore
  13. 2026-08-28 21:41 UTCEPSS rescore
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-25 13:48 UTCEPSS rescore
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-19 17:03 UTCEPSS rescore
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 10:37 UTCGHSA enrichment
  25. 2026-08-16 06:39 UTCEG score recompute
Show 75 more
  1. 2026-08-16 06:39 UTCGHSA enrichment
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 02:30 UTCEG score recompute
  4. 2026-08-15 02:30 UTCGHSA enrichment
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 22:20 UTCGHSA enrichment
  7. 2026-08-14 18:13 UTCGHSA enrichment
  8. 2026-08-14 12:38 UTCGHSA enrichment
  9. 2026-08-14 08:41 UTCGHSA enrichment
  10. 2026-08-14 04:45 UTCEG score recompute
  11. 2026-08-14 04:45 UTCGHSA enrichment
  12. 2026-08-13 22:00 UTCEPSS rescore
  13. 2026-08-13 08:56 UTCGHSA enrichment
  14. 2026-08-13 02:48 UTCGHSA enrichment
  15. 2026-08-12 22:51 UTCGHSA enrichment
  16. 2026-08-12 18:55 UTCEG score recompute
  17. 2026-08-12 18:54 UTCGHSA enrichment
  18. 2026-08-12 13:50 UTCEPSS rescore
  19. 2026-08-11 22:58 UTCGHSA enrichment
  20. 2026-08-11 18:51 UTCEG score recompute
  21. 2026-08-11 18:51 UTCGHSA enrichment
  22. 2026-08-11 13:42 UTCEPSS rescore
  23. 2026-08-11 06:36 UTCGHSA enrichment
  24. 2026-08-11 02:39 UTCEG score recompute
  25. 2026-08-11 02:39 UTCGHSA enrichment
  26. 2026-08-11 00:00 UTCEPSS rescore
  27. 2026-08-10 12:50 UTCGHSA enrichment
  28. 2026-08-10 08:30 UTCGHSA enrichment
  29. 2026-08-10 04:34 UTCGHSA enrichment
  30. 2026-08-10 00:37 UTCGHSA enrichment
  31. 2026-08-09 20:39 UTCGHSA enrichment
  32. 2026-08-09 16:43 UTCEG score recompute
  33. 2026-08-09 16:43 UTCGHSA enrichment
  34. 2026-08-09 13:46 UTCEPSS rescore
  35. 2026-08-09 12:46 UTCGHSA enrichment
  36. 2026-08-09 07:58 UTCGHSA enrichment
  37. 2026-08-09 04:01 UTCEG score recompute
  38. 2026-08-09 04:01 UTCGHSA enrichment
  39. 2026-08-08 16:37 UTCEPSS rescore
  40. 2026-08-08 09:12 UTCGHSA enrichment
  41. 2026-08-08 05:16 UTCGHSA enrichment
  42. 2026-08-08 01:19 UTCGHSA enrichment
  43. 2026-08-07 21:23 UTCGHSA enrichment
  44. 2026-08-07 17:26 UTCEG score recompute
  45. 2026-08-07 17:26 UTCGHSA enrichment
  46. 2026-08-07 13:30 UTCGHSA enrichment
  47. 2026-08-06 21:33 UTCGHSA enrichment
  48. 2026-08-06 17:29 UTCEG score recompute
  49. 2026-08-06 17:28 UTCGHSA enrichment
  50. 2026-08-06 13:46 UTCEPSS rescore
  51. 2026-08-06 12:10 UTCGHSA enrichment
  52. 2026-08-06 07:17 UTCGHSA enrichment
  53. 2026-08-06 03:20 UTCGHSA enrichment
  54. 2026-08-05 23:23 UTCEG score recompute
  55. 2026-08-05 23:23 UTCGHSA enrichment
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-04 15:10 UTCEPSS rescore
  58. 2026-08-04 10:38 UTCEPSS rescore
  59. 2026-08-04 05:38 UTCGHSA enrichment
  60. 2026-08-04 01:32 UTCGHSA enrichment
  61. 2026-08-03 21:36 UTCEG score recompute
  62. 2026-08-03 21:36 UTCGHSA enrichment
  63. 2026-08-03 10:35 UTCEPSS rescore
  64. 2026-08-03 01:08 UTCGHSA enrichment
  65. 2026-08-02 21:08 UTCGHSA enrichment
  66. 2026-08-02 17:12 UTCGHSA enrichment
  67. 2026-08-02 13:15 UTCEG score recompute
  68. 2026-08-02 13:15 UTCGHSA enrichment
  69. 2026-08-02 02:26 UTCEPSS rescore
  70. 2026-08-01 04:15 UTCEPSS rescore
  71. 2026-07-30 01:30 UTCEPSS rescore
  72. 2026-07-27 14:13 UTCEPSS rescore
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-25 14:17 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20184?
CVE-2026-20184 is a critical vulnerability published on April 15, 2026. A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service. This vulnerability existed because of improper certificate validation. Prior to this vulnerability…
When was CVE-2026-20184 disclosed?
CVE-2026-20184 was first published in the National Vulnerability Database on April 15, 2026, with the most recent update on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20184 actively exploited?
CVE-2026-20184 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.5% of all scored CVEs.
What is the CVSS score of CVE-2026-20184?
CVE-2026-20184 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-20184?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20184, 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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