---
id: CVE-2026-111358
title: >-
  SendPortal sendportal-core through 4.0.1 contains an authorization bypass
  vulnerability that allows authenticated workspace members to attach
  subscribers to other workspaces' tags by supplying unvalidated tag IDs
summary: >-
  SendPortal sendportal-core through 4.0.1 contains an authorization bypass
  vulnerability that allows authenticated workspace members to attach
  subscribers to other workspaces' tags by supplying unvalidated tag IDs.
  Attackers can submit se…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-639
vendor: mettle
product: sendportal-core
affected:
  - sendportal-core <= 4.0.1
published: '2026-10-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:25:45.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111358'
references:
  - url: 'https://github.com/mettle/sendportal-core'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Http/Requests/SubscriberRequest.php#L34-L37
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Repositories/Subscribers/BaseSubscriberTenantRepository.php#L48-L51
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/sendportal-sendportal-core-through-4.0.1-cross-workspace-tag-attachment-via-subscriber-form
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00319
epssPercentile: 0.24755
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:55:17.600296Z'
ingestedAt: '2026-10-15T22:48:25.458Z'
---

## Overview

SendPortal sendportal-core through 4.0.1 contains an authorization bypass vulnerability that allows authenticated workspace members to attach subscribers to other workspaces' tags by supplying unvalidated tag IDs. Attackers can submit sequential tag IDs via the web subscriber form or CSV import to receive victim campaign content and skew victim reports.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.