TI-2026-15150 Aliases CVE-2026-18436 GHSA-vfgx-g9m5-wfgv

MailerPress <= 1.5.0 - Missing Authorization to Unauthenticated Arbitrary Modification via REST API Endpoint

LOW 30CWE-862Published 2026-07-31 · Updated 2026-07-31

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0039 33rd 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: None
Automatable: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
mailerpress	MailerPress – Newsletter, email marketing & AI automation	up to 1.5.0	—	No fix listed	CNA

MailerPress – Newsletter, email marketing & AI automation Vendormailerpress Affected up to 1.5.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-18436
2026-10-03 Alias added: GHSA-vfgx-g9m5-wfgv

References

Other 3

TI-2026-15151 MailPress <= 1.5.0 - Missing Authorization to Unauthenticated Contact Updates CVSS 3.1MEDIUM 5.3
TI-2026-07557 MailerPress <= 2.0.4 - Authenticated (Author+) Stored Cross-Site Scripting via Campaign HTML Content Field CVSS 3.1MEDIUM 6.4

Sources

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