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CVE-2026-108446

CVE-2026-108446

waiting for further signalsZero needs more public information before it can validate it.

EUVD-2026-102458 ↗

no check availablenot proven exploitable
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.
Microsoft 365 Apps for Enterprise >= 1.0.0, < 16.114.26101123; >= 16.0.1, < 16.0.14334.20974; >= 16.0.0, < 16.0.17932.21056; >= 16.0.1, < 16.114.26101123; >= 16.0.0, < 16.114.26101123; >= 16.0.0.0, < 16.0.10417.20228; >= 16.0.1, < https://aka.ms/OfficeSecurityReleases
fixed in https://aka.ms/OfficeSecurityReleases, 16.114.26101123, 16.0.14334.20974, 16.0.17932.21056, 16.0.10417.20228
CWE-416 Use After Free
ETK-2026-1738Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss8.8cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
3d 03h 50msince last run
11mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+52h01m
0
+2h
+4h
+6h
+8h
+10h

description

Microsoft Office Excel in the listed Microsoft 365, Office LTSC, Mac, and Office Online Server products is affected by a memory-lifetime flaw. An unauthenticated remote attacker may be able to run code if required user interaction occurs.

mitigation

Apply the current Microsoft 365 Apps for Enterprise security release, and update Office for Mac and Office LTSC for Mac to 16.114.26101123. Update Office LTSC 2021 to 16.0.14334.20974, Office LTSC 2024 to 16.0.17932.21056, and Office Online Server to 16.0.10417.20228.

fixed in https://aka.ms/OfficeSecurityReleases, 16.114.26101123, 16.0.14334.20974, 16.0.17932.21056, 16.0.10417.20228

check
no
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.
0.43%36th percentile
agent run time
11m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-15 20:57Z
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: an exploit technique exists, 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. 2026-10-15 20:57Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-108446

this entry in the feed

GET /api/v1/feed/CVE-2026-108446

{
  "etk_id": "ETK-2026-1738",
  "cve_id": "CVE-2026-108446",
  "display_id": "CVE-2026-108446",
  "ghsa_id": null,
  "euvd_id": "EUVD-2026-102458",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Use-after-free in Microsoft Office Excel",
  "summary": "Microsoft Office Excel in the listed Microsoft 365, Office LTSC, Mac, and Office Online Server products is affected by a memory-lifetime flaw. An unauthenticated remote attacker may be able to run code if required user interaction occurs.",
  "mitigation": "Apply the current Microsoft 365 Apps for Enterprise security release, and update Office for Mac and Office LTSC for Mac to 16.114.26101123. Update Office LTSC 2021 to 16.0.14334.20974, Office LTSC 2024 to 16.0.17932.21056, and Office Online Server to 16.0.10417.20228.",
  "vendor": "Microsoft",
  "product": "Microsoft 365 Apps for Enterprise",
  "affected": [
    {
      "affected_notes": [
        ">= 16.0.1, < https://aka.ms/OfficeSecurityReleases"
      ],
      "affected_ranges": [],
      "ecosystem": null,
      "fixed_versions": [
        "https://aka.ms/OfficeSecurityReleases"
      ],
      "package_name": "Microsoft 365 Apps for Enterprise",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.0.0, < 16.114.26101123"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.114.26101123"
      ],
      "package_name": "Microsoft Office 365 for Mac",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 16.0.1, < 16.0.14334.20974"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.0.14334.20974"
      ],
      "package_name": "Microsoft Office LTSC 2021",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 16.0.0, < 16.0.17932.21056"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.0.17932.21056"
      ],
      "package_name": "Microsoft Office LTSC 2024",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 16.0.1, < 16.114.26101123"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.114.26101123"
      ],
      "package_name": "Microsoft Office LTSC for Mac 2021",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 16.0.0, < 16.114.26101123"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.114.26101123"
      ],
      "package_name": "Microsoft Office LTSC for Mac 2024",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 16.0.0.0, < 16.0.10417.20228"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "16.0.10417.20228"
      ],
      "package_name": "Office Online Server",
      "purl": null
    }
  ],
  "cwes": [
    416
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
  "epss_score": 0.0043,
  "epss_percentile": 0.3621,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.326891083333333,
  "t0_at": "2026-10-15T20:57:27.027000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-15T20:57:27.027000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T20:57:27.027000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-108446"
    }
  }
}

published 2026-10-16 00:10Z
last change 2026-10-21 04:45Z

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