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TI-2026-75091 Aliases CVE-2026-111358

Authorization bypass in SendPortal lets members attach subscribers to other tags

Priority MEDIUM 57CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

SendPortal sendportal-core through 4.0.1 contains an authorization bypass that lets authenticated workspace members attach subscribers to other workspaces' tags by supplying unvalidated tag IDs (CWE-639). An attacker with low privileges can submit sequential tag IDs through the web subscriber form or CSV import to receive victim campaign content and skew victim reports.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mettlesendportal-coreup to 4.0.1—No fix listedCNA
  • sendportal-core Vendormettle Affected up to 4.0.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for sendportal-core.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111358
  2. 2026-10-16 CISA SSVC decision points changed
  3. 2026-10-16 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 3

  • TI-2026-12796 mettle sendportal APIv1 Webhooks mailjet missing authentication CVSS 4.0MEDIUM 6.9
  • TI-2026-12795 mettle sendportal Campaign Creation Endpoint CampaignStoreRequest.php authorization CVSS 4.0MEDIUM 5.3
  • TI-2026-08972 Mettle sendportal Campaign webview cross site scripting CVSS 4.0MEDIUM 5.1
  • TI-2026-06268 mettle sendportal Invitation WorkspaceInvitationsController.php destroy authorization CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences