Threat Intelligence / CVE / CVE-2026-15748

CVE-2026-15748 — wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder

CVSS v3.1 9.8 (CRITICAL) · Priority 4.9/10 · Published 2026-08-18

As of 2026-08-18, CVE-2026-15748 is a CRITICAL-severity vulnerability in wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder, CVSS v3.1 9.8. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-15748, most recently “CVE-2026-15748: Forminator WordPress Plugin Arbitrary File Upload Enables Unauthenticated RCE”.

Last updated: 2026-08-18

What is CVE-2026-15748?

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

The record classifies CVE-2026-15748 under weakness class CWE-434. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 35 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-08-18

Is CVE-2026-15748 being exploited?

No public exploitation evidence for CVE-2026-15748 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-18. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-15748

No vendor patch reference has been recorded for CVE-2026-15748 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-15748

1 tracked threat in the Threadlinqs corpus references CVE-2026-15748, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org. Last verified by Threadlinqs on .

Other references

Showing 5 of 7 recorded references.

Full detection coverage & IOCs for threats exploiting CVE-2026-15748 are available via the Threadlinqs MCP server (Purple tier). View plans →

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