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Forminator Forms EUVDEUVD-2026-85192

| CVE-2026-87071 MEDIUM
Improper Input Validation (CWE-20)
2026-09-23 WPScan GHSA-p6xg-237f-rf4g
5.3
CVSS 3.1 · Vendor: WPScan
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Locate public Forminator post-creation form
  2. Delivery
    Craft submission with reserved/arbitrary metadata keys
  3. Exploit
    Submit form as unauthenticated visitor
  4. Execution
    Plugin saves unfiltered metadata to post
  5. Impact
    Post attributes manipulated

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Exploitation Conditions

Requires the target WordPress site to expose a public Forminator form (plugin before 1.57.2.1) that is configured with post-creation functionality - i.e. a form that collects post content and creates a post from each submission. Only such post-generating forms are affected; ordinary contact/lead forms that do not create posts are not exploitable. No authentication or user interaction beyond a normal form submission is needed (PR:N/UI:N), but the non-default post-submission feature must be enabled, which limits real-world exposure. Impact is confined to injecting attacker-chosen and WordPress-reserved metadata keys onto the created post (low integrity impact).

Impact

This is a genuine but limited-impact issue best treated as a low-to-moderate priority. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N = 5.3) correctly captures a remotely reachable, low-complexity, unauthenticated flaw whose only impact is a low integrity effect (C:N/A:N) - the attacker can inject arbitrary/reserved metadata onto a WordPress post that their form submission creates, not read data or crash the site. A public exploit reference exists via WPScan, so exploitability is demonstrated, but there is NO EPSS score and NO CISA KEV listing supplied, so there is no evidence of active or widespread exploitation - POC availability and active exploitation are distinct signals and only the former is present here. The realistic risk is gated by a non-default prerequisite: the site must run a public Forminator form that collects post content and creates posts. Note the 'Information Disclosure' tag conflicts with the CVSS impact metrics (C:N, I:L), which indicate an integrity/data-manipulation issue, not disclosure - treat the tag as mislabeled. Net: a real, credible flaw in a very popular plugin, but bounded impact and conditional exposure keep it below true high-priority status.

Exploit ScenarioDerived

An unauthenticated visitor finds a public Forminator form configured to create WordPress posts (a post-submission/front-end posting form) and submits it with extra crafted metadata keys - including keys WordPress reserves internally. Because the plugin does not filter or exclude these keys before saving, the attacker-chosen metadata is attached to the newly created post, letting them manipulate post attributes or internal fields. A public exploit/write-up is available via WPScan.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 23, 2026

Unauthenticated metadata injection in the Forminator Forms WordPress plugin before 1.57.2.1 allows any visitor who submits a public form to attach arbitrary metadata keys - including keys WordPress reserves for its own use - to the post that submission creates. The issue is confined to forms explicitly configured with Forminator's post-creation feature (forms that collect post content and publish a post per submission); ordinary contact, lead, or newsletter forms that never create posts are not exposed, which keeps real-world reach narrow and impact low (integrity-only). Publicly available exploit code exists per the WPScan reference, exploitation status is not confirmed actively exploited (CISA KEV) and no EPSS value was supplied; the assessed vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N yields a 5.3 base score, consistent with a low-to-moderate priority finding.

RemediationAI

Vendor-released patch: Forminator Forms 1.57.2.1 - upgrade the plugin to 1.57.2.1 or later, which is the boundary given in the affected-version data, and confirm the update on every site where the plugin is active (see https://wpscan.com/vulnerability/9d831b9d-c05d-4b9a-8b65-7e1e35e68510/ for the vendor reference). Where an immediate upgrade is not possible, the most direct compensating control is to remove the post-creation capability from any publicly reachable form, or restrict such forms to authenticated/trusted submitters, accepting that this disables the auto-publishing behavior those forms were built for; if post creation must stay public, add a submission-side allow-list that permits only the specific meta keys your integration expects and rejects underscore-prefixed or WordPress-reserved keys, understanding that a custom filter is not a vendor-supported fix and must be re-verified after each plugin update. As a detection and cleanup step, audit recently created posts for unexpected or reserved meta keys (for example _thumbnail_id and other protected entries) and remove any that cannot be attributed to legitimate plugin or theme behavior. Note that no patch-availability gap is recorded in the supplied data, and no CISA KEV active-exploitation flag is present, so remediation can be scheduled as low-to-moderate priority rather than as an emergency response.

Affected VersionsENISA

Forminator Forms 0 <1.57.2.1

Affected Packages

euvd forminator_forms fix: 1.57.2.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

WordPress stores per-post custom fields as meta_key/meta_value rows in the postmeta table, and core plus plugins/themes trust a set of reserved, typically underscore-prefixed keys (for example _edit_lock, _thumbnail_id and similar protected entries) that are not intended to be attacker-supplied. Forminator's post-creation path assembles a new post from submitted form fields, and before 1.57.2.1 it forwarded a submission-provided metadata map without allow-listing permitted keys or stripping keys reserved by WordPress core - an unrestricted-input / metadata mass-assignment class of defect (no CWE identifier was assigned in the supplied data). The reachable surface is the public form submission endpoint, which the assessed vector classifies as unauthenticated (PR:N) and requiring no user interaction (UI:N), so the only gating prerequisite is the non-default post-submission configuration. The supplied CPE cpe:2.3:a:unknown:forminator_forms:*:*:*:*:*:*:*:* identifies the plugin generically with an unrecorded vendor, so affectedness is best determined by the plugin's own version boundary against the 1.57.2.1 fix rather than by CPE matching.

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Severity by source

Vendor (WPScan) PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
vuln.today AI 5.3 MEDIUM

Remote unauthenticated form submission (AV:N/AC:L/PR:N/UI:N); only unauthorized metadata modification on the created post yields I:L with no confidentiality or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (WPScan).

CVSS VectorVendor: WPScan

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
Sep 23, 2026 - 11:17 EUVD
CVE Published
Sep 23, 2026 - 10:11 cve.org
MEDIUM 5.3

DescriptionCVE.org

The Forminator Forms WordPress plugin before 1.57.2.1 does not restrict which metadata keys a form submission may supply, and does not exclude the keys WordPress reserves for its own use, so unauthenticated visitors submitting a public form that collects post content can attach metadata of their choosing to the post their submission creates.

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Prevalence
Medium
very popular WordPress form plugin, but affected feature is post-creating forms
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0
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