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ETK-2026-1851Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1851Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-c8rg-2r2h-5vgc ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
composer:freescout-helpdesk/freescout <1.8.248
fixed in 1.8.248
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
ETK-2026-1851Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:composer/freescout-helpdesk/freescout
cvss7.5cna vendorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
−4.3dTTV
29mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org, not yet published
trigger signal −4.3dcheck available−4.3dagent stopped
−4d
−3d
−2d
−1d
0

description

FreeScout versions through 1.8.247 can process concurrent redemptions of the same valid invitation as separate successful activations. An attacker who possesses a live invitation URL may obtain an authenticated session for the invited account by racing the intended recipient; this can include administrator access when the invitation is for an administrator.

mitigation

Upgrade freescout-helpdesk/freescout to version 1.8.248 or later. Until upgrading, revoke and reissue exposed or untrusted outstanding invitations and limit access to invitation URLs.

fixed in 1.8.248

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.
deterministic
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
29m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
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

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.

  1. 2026-10-17 05:04Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1851

{
  "etk_id": "ETK-2026-1851",
  "cve_id": null,
  "display_id": "ETK-2026-1851",
  "ghsa_id": "GHSA-c8rg-2r2h-5vgc",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Invitation redemption race condition in FreeScout",
  "summary": "FreeScout versions through 1.8.247 can process concurrent redemptions of the same valid invitation as separate successful activations. An attacker who possesses a live invitation URL may obtain an authenticated session for the invited account by racing the intended recipient; this can include administrator access when the invitation is for an administrator.",
  "mitigation": "Upgrade freescout-helpdesk/freescout to version 1.8.248 or later. Until upgrading, revoke and reissue exposed or untrusted outstanding invitations and limit access to invitation URLs.",
  "vendor": "composer",
  "product": "composer:freescout-helpdesk/freescout",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<1.8.248"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "1.8.248"
      ],
      "package_name": "freescout-helpdesk/freescout",
      "purl": "pkg:composer/freescout-helpdesk/freescout"
    }
  ],
  "cwes": [
    362
  ],
  "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": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 29.409895133333332,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-17T05:41:16.381154+00:00",
      "days": -4.290873006377315,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T12:40:08.020622+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-17T05:04:34+00:00",
      "days": -4.3163635289930555,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T12:40:08.020622+00:00",
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-c8rg-2r2h-5vgc"
    }
  }
}

published 2026-10-17 05:11Z
last change 2026-10-21 12:26Z

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