CVE-2026-76183

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.4% (30th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss
Trending — 4 sources updated this week
9.8EG
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: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.

The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 45%
Exploitation0% × 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
30th
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 none (CISA Vulnrichment) · Automatable yes (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

September 23, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 30, 2026
Patch available.
generic

oss-security - CVE-2026-76183: Apache Tomcat: Bypass of security constraints for WebSocket endpoints

http://www.openwall.com/lists/oss-security/2026/09/23/21
generic

Pony Mail

https://lists.apache.org/thread/45mxk8nj2q8pkhct6lfxkvtm2jpywrsp

Vendor Advisories for CVE-2026-76183(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhattomcat10-main-10.1.60-0.1.hum12026-09-16redhat
redhattomcat11-main-11.0.26-0.1.hum12026-09-16redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 83× in last 7d / 118× 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 118 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-76183?
CVE-2026-76183 is a critical vulnerability published on September 23, 2026. Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions…
When was CVE-2026-76183 disclosed?
CVE-2026-76183 was first published on September 23, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76183 actively exploited?
CVE-2026-76183 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76183?
CVE-2026-76183 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-76183?
A fix for CVE-2026-76183 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76183 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-76183

Explore →

Is Your Infrastructure Affected by CVE-2026-76183?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs