Auth bypass in Mettle Sendportal-Core
CVE-2026-111358
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/sendportal-subscriber-tags-cross-workspace-attach (third-party-advisory)
- github.com/mettle/sendportal-core/blob/v4.0.1/src/Repositories/Subscribers/Base… (technical-description)
- github.com/mettle/sendportal-core/blob/v4.0.1/src/Http/Requests/SubscriberReque… (technical-description)
- github.com/mettle/sendportal-core (product)
- www.vulncheck.com/advisories/sendportal-sendportal-core-through-4.0.1-cross-wor… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111358?
- CVE-2026-111358 is a medium-severity vulnerability in Mettle Sendportal-Core, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-15.
- How severe is CVE-2026-111358?
- Medium severity. CVSS v3 base score is 5.4 out of 10.