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Drupal Webform EUVDEUVD-2026-107832

| CVE-2026-96366 MEDIUM
Incorrect Authorization (CWE-863)
2026-10-22 drupal GHSA-2mhr-gxgf-94fj
5.3
CVSS 3.1 · Vendor: drupal
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Attack ChainAIDerived

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

  1. Access
    Request restricted Webform URL directly
  2. Exploit
    Authorization check incorrectly permits access
  3. Impact
    Disclose restricted Webform data

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization logic validation
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

The description identifies the mechanism only as Incorrect Authorization enabling 'forceful browsing' - an attacker directly accessing a Webform resource via a known or guessed URL that should be access-controlled - but it does not name the exact form, submission view, or endpoint affected, so the precise trigger is not described in the available sources. Per the CVSS vector (PR:N/UI:N), no authentication or user interaction is required and exploitation works remotely against affected Webform installations (0.0.0-6.2.12 and 6.3.0-6.3.1). The principal limiting factor is impact scope: the flaw yields only low confidentiality exposure (C:L) with no integrity or availability impact, so it enables unauthorized reading of restricted data rather than modification or takeover; exploitation is also bounded to sites running the affected Webform versions on Drupal.

Impact

This is a medium-severity information-disclosure issue (CVSS 5.3) whose real-world urgency is moderate, not critical. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) indicates a remotely reachable, low-complexity flaw that needs no privileges or user interaction, but its impact is deliberately narrow - only low confidentiality loss, with no integrity or availability impact, consistent with CWE-863 Incorrect Authorization enabling forceful browsing to resources the user should not reach. The exploitation signals all point the same direction and are mutually consistent: EPSS is very low at 0.20% (9th percentile), the CVE is NOT on the CISA KEV list, and no public exploit is identified in the provided data. The vuln.today decision label is 'this_month' rather than 'act_now' or 'emergency', reinforcing that this warrants scheduled remediation rather than crisis response. No SSVC decision tree (automatable / technical impact) was supplied, so that framework cannot be independently applied. There is no conflict among the signals here - a genuinely reachable but low-impact disclosure bug with low predicted exploitation. Treat it as a real but non-emergency priority: apply the vendor patch within the normal monthly maintenance window.

Exploit ScenarioDerived

A remote, unauthenticated attacker directly requests a Webform resource or endpoint (for example by navigating to or guessing a URL) that should have been access-restricted, and the incorrect authorization check fails to block them, disclosing information they should not be able to see. No public exploit code is identified in the provided data, and the limited C:L impact means the attacker gains read-level exposure rather than control of the site. The exact resource and request that trigger the flaw are not described in the available sources.

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 – Oct 22, 2026

Unauthenticated remote attackers can bypass access controls in the Drupal Webform contributed module to read data that should be restricted, affecting versions 0.0.0 through 6.2.12 and 6.3.0 through 6.3.1. Rated CVSS 5.3 with low confidentiality impact only, the flaw cannot modify or delete content and does not affect availability, so exposure is limited to unauthorized disclosure via direct requests to access-controlled Webform resources. No public exploit code or active exploitation is confirmed at time of analysis, and EPSS sits at 0.20% (9th percentile), consistent with a moderate rather than urgent patching priority.

RemediationAI

Vendor-released patch: update the Drupal Webform module to a fixed release outside the affected ranges - sites on the 6.2.x line should move beyond 6.2.12 and sites on 6.3.x should move beyond 6.3.1, per the Drupal security advisory at https://www.drupal.org/sa-contrib-2026-169. Patch availability is confirmed from the vendor, and because the defect is an access-control flaw rather than a configuration weakness, updating the module is the complete fix; the advisory should be reviewed for any interim guidance it states. Until the update is applied, the exposure is limited to low-confidentiality disclosure with no integrity or availability impact, but access-controlled Webform resources remain readable by unauthenticated remote requests, so scheduling the upgrade within the current monthly maintenance window (vuln.today priority: this_month) is appropriate; EPSS is 0.20% and no public exploit or KEV listing is confirmed.

Affected VersionsENISA

Webform 6.3.0 <6.3.1
Webform 0.0.0 <6.2.12

Affected Packages

composer drupal/webform fix: 6.2.12, 6.3.1
euvd webform fix: 6.2.12, 6.3.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in composer, euvd

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

Technical ContextAI · show details

The vulnerability is an Incorrect Authorization weakness (CWE-863) in the Webform module for Drupal, the widely deployed contributed module used to build forms and manage submissions. The authorization logic governing access to a Webform resource fails to correctly enforce the intended access check, permitting 'forceful browsing' - a direct request to a known or guessed URL that should have been denied. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) confirms the attack is network-reachable, requires no authentication or user interaction, and is scoped to the vulnerable component with only low confidentiality impact and no integrity or availability effect. The advisory does not name the specific form, submission view, or endpoint at issue, so the precise trigger is not described in the available sources. Affected deployments are those running the Webform module within the vulnerable ranges (0.0.0 to 6.2.12 and 6.3.0 to 6.3.1) on a Drupal site.

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Severity by source

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

Forceful browsing is remotely reachable with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is unauthorized read of restricted data only, so C:L with I:N and A:N.

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

Primary rating from Vendor (drupal).

CVSS VectorVendor: drupal

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

Lifecycle Timeline

3
CVSS changed
Oct 22, 2026 - 15:22 NVD
5.3 (MEDIUM)
Patch available
Oct 22, 2026 - 03:01 EUVD
CVE Published
Oct 22, 2026 - 01:21 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect Authorization vulnerability in Drupal Webform allows Forceful Browsing. This issue affects Webform versions: from 0.0.0 to 6.2.12, from 6.3.0 to 6.3.1.

Threat Intelligence Overview

EPSS Score
0.2%
Top 91% exploitable
Prevalence
Medium
most-installed Drupal form module, but Drupal is a minority CMS
Data Quality
5 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 No
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

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

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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