CVE-2026-75957

validated

GHSA-xr7j-wm8w-c5p4 ↗EUVD-2026-90546 ↗

check availablenot proven exploitable

cve.orgpublic pockev

superdav42 Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform <= 2.15.0

CWE-287 Improper Authentication

ETK-2026-221, permanent identifier

cvss9.8cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

+2h50mTTV

28mAI analysis

Check if you are vulnerable

timeline

0 = trigger signal

trigger signal (cve.org) +0hcheck available+2h50magent stopped

+1h

+2h

+3h

description

Ultimate Multisite for WordPress is affected through version 2.15.0. An unauthenticated attacker may obtain a login session for an existing WordPress account, potentially including a network administrator account, when that account has no Ultimate Multisite customer record.

mitigation

Disable the Ultimate Multisite plugin on affected sites until the supplier provides an update; no fixed version is recorded. Review affected accounts and active sessions, especially privileged accounts without associated customer records.

check

available

exploit

automation

deterministic

auth required

EPSS

0.58%46th percentile

agent run time

28m

cve.org record, t = 0

2026-10-01 07:40Z

Δ to public poc

–

Δ to kev

–

outcome

Check only, differential: the check fires on the vulnerable build and is silent on the patched one.

source signals

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

2026-10-01 07:40Z
cve_org: trigger signal, started the run
https://www.cve.org/CVERecord?id=CVE-2026-75957

this entry in the feed

GET /api/v1/feed/CVE-2026-75957

{
  "etk_id": "ETK-2026-221",
  "cve_id": "CVE-2026-75957",
  "display_id": "CVE-2026-75957",
  "ghsa_id": "GHSA-xr7j-wm8w-c5p4",
  "euvd_id": "EUVD-2026-90546",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authentication bypass in Ultimate Multisite WordPress plugin",
  "summary": "Ultimate Multisite for WordPress is affected through version 2.15.0. An unauthenticated attacker may obtain a login session for an existing WordPress account, potentially including a network administrator account, when that account has no Ultimate Multisite customer record.",
  "mitigation": "Disable the Ultimate Multisite plugin on affected sites until the supplier provides an update; no fixed version is recorded. Review affected accounts and active sessions, especially privileged accounts without associated customer records.",
  "vendor": "superdav42",
  "product": "Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, <= 2.15.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Ultimate Multisite – WordPress Multisite SaaS & WaaS Platform",
      "purl": null
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 9.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0058,
  "epss_percentile": 0.4647,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 27.92326425,
  "t0_at": "2026-10-01T07:40:23.541000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-01T10:29:57.917627+00:00",
      "days": 0.11775898873842593,
      "is_lower_bound": false,
      "measured_at": "2026-10-01T07:40:23.541000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-01T07:40:23.541000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-01T07:40:23.541000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-75957"
    }
  }
}

published 2026-10-01 08:50Z
last change 2026-10-21 07:48Z

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