---
id: CVE-2026-111358
title: >-
  SendPortal sendportal-core through 4.0.1 Cross-Workspace Tag Attachment via
  Subscriber Form
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'
cvssSource: cna
cwe:
  - CWE-639
vendor: mettle
product: sendportal-core
affected:
  - sendportal-core <= 4.0.1
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:43:46.335Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111358'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach
  - url: >-
      https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Repositories/Subscribers/BaseSubscriberTenantRepository.php#L48-L51
  - url: >-
      https://github.com/mettle/sendportal-core/blob/v4.0.1/src/Http/Requests/SubscriberRequest.php#L34-L37
  - url: 'https://github.com/mettle/sendportal-core'
  - url: >-
      https://www.vulncheck.com/advisories/sendportal-sendportal-core-through-4.0.1-cross-workspace-tag-attachment-via-subscriber-form
    label: >-
      VulnCheck Advisory: SendPortal sendportal-core through 4.0.1
      Cross-Workspace Tag Attachment via Subscriber Form
tags:
  - cve.org
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.

## Affected

- `sendportal-core <= 4.0.1`

## Remediation

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