CVE-2026-12591

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

GHSA-v53h-q7r3-wr4w ↗EUVD-2026-124322 ↗

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.
Zohocorp M365 Manager Plus < 4818
fixed in 4818
CWE-862 Missing Authorization
ETK-2026-4251Zero's internal tracking ID, independent of the CVE number., permanent identifier
39msince last run
22mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org publication
trigger signal (cve.org) +0hwaiting for further signals+3h29m
0
+2h
+6h
+8h
+10h
+12h

description

M365 Manager Plus builds below 4818 have an authorization flaw in delegated administration. An authenticated technician could obtain privileges beyond their intended scope and may trigger code execution during administrative processing. Exploitation requires a technician account.

mitigation

Upgrade M365 Manager Plus to build 4818 or later. Review delegated technician accounts and remove unnecessary permissions until the update is complete.

fixed in 4818

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.
yes, low privileges
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
22m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-12 06:55Z
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, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

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

  1. 2026-11-12 06:55Z
    cve_org: trigger signal, started the run

this entry in the feed

GET /api/v1/feed/CVE-2026-12591

{
  "etk_id": "ETK-2026-4251",
  "cve_id": "CVE-2026-12591",
  "display_id": "CVE-2026-12591",
  "ghsa_id": "GHSA-v53h-q7r3-wr4w",
  "euvd_id": "EUVD-2026-124322",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper authorization in M365 Manager Plus delegated administration",
  "summary": "M365 Manager Plus builds below 4818 have an authorization flaw in delegated administration. An authenticated technician could obtain privileges beyond their intended scope and may trigger code execution during administrative processing. Exploitation requires a technician account.",
  "mitigation": "Upgrade M365 Manager Plus to build 4818 or later. Review delegated technician accounts and remove unnecessary permissions until the update is complete.",
  "vendor": "Zohocorp",
  "product": "M365 Manager Plus",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 4818"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "4818"
      ],
      "package_name": "M365 Manager Plus",
      "purl": null
    }
  ],
  "cwes": [
    862
  ],
  "cvss_score": 9.9,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 21.716820133333332,
  "t0_at": "2026-11-12T06:55:31.695000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-12T06:55:31.695000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-12T06:55:31.695000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-12591"
    }
  }
}

published 2026-11-12 07:32Z
last change 2026-11-12 10:36Z

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