← back to feed
CVE-2026-109481

CVE-2026-109481

validatedZero produced an exploit or a check.

GHSA-xw2x-23jm-j582 ↗EUVD-2026-121580 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
nuget:Microsoft.AspNetCore.App.Runtime.linux-arm >= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148
fixed in 11.0.0
CWE-352 Cross-Site Request Forgery (CSRF)
ETK-2026-4121Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-arm64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x64
pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x86
cvss7.5cna vendorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
+6h09mTTV
14mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org publication
trigger signal (cve.org) +0hcheck available+6h09magent stopped
0
+2h
+4h

description

Affected ASP.NET Core 11 preview and release-candidate runtime packages mishandle cross-site requests to the Blazor/SignalR refresh endpoint. An attacker may associate an authenticated victim's identity with an attacker-controlled circuit if the victim is induced to send such a request.

mitigation

Update the applicable Microsoft.AspNetCore.App.Runtime package or runtime to version 11.0.0 and restart applications. Rebuild and redeploy self-contained applications, because updating a machine-wide runtime does not replace their bundled runtime.

fixed in 11.0.0

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
14m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-10 18:15Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-11-10 18:15Z
  2. 2026-11-10 18:15Z

this entry in the feed

GET /api/v1/feed/CVE-2026-109481

{
  "etk_id": "ETK-2026-4121",
  "cve_id": "CVE-2026-109481",
  "display_id": "CVE-2026-109481",
  "ghsa_id": "GHSA-xw2x-23jm-j582",
  "euvd_id": "EUVD-2026-121580",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Cross-site request forgery in ASP.NET Core Blazor/SignalR",
  "summary": "Affected ASP.NET Core 11 preview and release-candidate runtime packages mishandle cross-site requests to the Blazor/SignalR refresh endpoint. An attacker may associate an authenticated victim's identity with an attacker-controlled circuit if the victim is induced to send such a request.",
  "mitigation": "Update the applicable Microsoft.AspNetCore.App.Runtime package or runtime to version 11.0.0 and restart applications. Rebuild and redeploy self-contained applications, because updating a machine-wide runtime does not replace their bundled runtime.",
  "vendor": "nuget",
  "product": "nuget:Microsoft.AspNetCore.App.Runtime.linux-arm",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-arm",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-arm64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-musl-arm",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-musl-arm64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-musl-x64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.linux-x64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-x64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.osx-arm64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-arm64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.osx-x64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-x64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.win-arm64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-arm64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.win-x64",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x64"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.6.26359.118, <= 11.0.0-rc.3.26522.148"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0"
      ],
      "package_name": "Microsoft.AspNetCore.App.Runtime.win-x86",
      "purl": "pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x86"
    }
  ],
  "cwes": [
    352
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 14.3641988,
  "t0_at": "2026-11-10T18:15:33.744000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-11T00:24:16.205917+00:00",
      "days": 0.2560470129282407,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T18:15:33.744000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-10T18:15:33.744000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T18:15:33.744000+00:00",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-xw2x-23jm-j582"
    }
  }
}

published 2026-11-11 00:09Z
last change 2026-11-11 05:00Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.

Protected by reCAPTCHA; the Google Privacy Policy and Terms of Service apply.