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Broker VM EUVDEUVD-2026-30090

| CVE-2026-0238 LOW
Improper Input Validation (CWE-20)
2026-05-13 palo_alto GHSA-gxm4-cg9r-54vw
1.1
CVSS 4.0 · Vendor: palo_alto
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Attack ChainAIDerived

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

  1. Access
    Obtain Broker VM administrator credentials
  2. Delivery
    Authenticate to local management interface
  3. Exploit
    Submit crafted input into vulnerable field
  4. Execution
    Inject arbitrary content into Broker VM configuration or logs
  5. Impact
    Achieve limited integrity impact on appliance data

Vulnerability Assessment

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

Exploitation requires the attacker to hold an authenticated administrator account on the Palo Alto Networks Broker VM - PR:L in the CVSS vector confirms low-privilege (but authenticated) access is required. The attack vector is local (AV:L), meaning the attacker must have logical access to the Broker VM management interface, not just network reachability. Only Broker VM release 30.0 builds prior to 30.0.24 are confirmed vulnerable. Limiting factors include: no remote unauthenticated path exists, the attack is not automatable (SSVC: Automatable: no), and the scope is restricted to integrity of the vulnerable system and subsequent systems only - no confidentiality breach or service disruption results. Organizations where Broker VM administrator access is tightly controlled and audited face negligible realistic risk.

Impact

All available signals converge on very low real-world risk. The CVSS 4.0 score of 1.1 reflects: a local attack vector (AV:L) requiring physical or logical local access, low privileges required (PR:L, meaning an authenticated administrator session is needed), no confidentiality impact (VC:N, SC:N), and only limited integrity impact on the vulnerable and subsequent system (VI:L, SI:L). The EPSS score of 0.03% places this in the 8th percentile - nearly the floor of exploitation probability. SSVC assessment aligns: exploitation status is none, the attack is not automatable, and technical impact is only partial. The CVSS 4.0 supplemental metric U:Amber signals limited confidence in some vector components, but this ambiguity does not materially change the low-risk conclusion. The sole realistic concern is insider threat or a compromised administrator account, which would already represent a significant access breach. This is not a priority for most security teams unless strict administrative integrity controls are mandated by compliance frameworks.

Exploit ScenarioDerived

An insider or attacker who has already compromised a Broker VM administrator account logs into the management interface locally and submits crafted input into an unsanitized field, injecting content that persists in the appliance's configuration or logs. Because the attack requires an authenticated administrator session and local access, it is most plausible as an insider threat or a post-compromise lateral movement step after credentials are stolen. No public exploit identified at time of analysis, and the E:U (unreported exploit maturity) metric in the CVSS vector confirms no known exploit code exists.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 08, 2026

Content injection in Palo Alto Networks Broker VM 30.0 (versions prior to 30.0.24) allows an authenticated administrator with local access to inject arbitrary content into certain administrative fields within the appliance. The vulnerability carries a CVSS 4.0 score of 1.1, reflecting its highly constrained exploitation prerequisites: local access, low-privilege authentication, and limited integrity impact with no confidentiality or availability consequences. No public exploit identified at time of analysis, and SSVC assessment confirms no observed exploitation, making this a low-urgency finding for most organizations.

RemediationAI

The vendor-released patch is Broker VM 30.0.24, which resolves the improper input validation defect. Organizations running Broker VM 30.0 prior to 30.0.24 should upgrade to 30.0.24 or later per the Palo Alto Networks advisory at https://security.paloaltonetworks.com/CVE-2026-0238. Because exploitation requires an authenticated administrator session with local access, the immediate compensating control - if patching is delayed - is to enforce strict administrative account hygiene: apply multi-factor authentication to all Broker VM administrator accounts, restrict console and management interface access to dedicated jump hosts, and audit administrator activity logs for anomalous field modifications. These controls directly address the attack surface by limiting who can reach the vulnerable input fields. No significant trade-offs apply to the patch itself; upgrade impact should be assessed per standard Palo Alto Networks VM maintenance procedures.

Affected VersionsENISA

Broker VM 30.0 <30.0.24

Affected Packages

euvd broker_vm fix: 30.0.24

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

Palo Alto Networks Broker VM is a virtual appliance that functions as an intermediary for cloud-delivered security services, brokering traffic between enterprise environments and Palo Alto's cloud infrastructure. The vulnerability is rooted in CWE-20 (Improper Input Validation), meaning certain administrator-facing input fields in the Broker VM management interface fail to adequately sanitize or restrict the content that can be submitted. This allows injection of arbitrary content - likely affecting stored data, configuration fields, or log entries - rather than achieving remote code execution. The CPE string (cpe:2.3:a:palo_alto_networks:broker_vm:*:*:*:*:*:*:*:*) confirms the flaw is in the Broker VM application itself, and EUVD data narrows the affected scope to the 30.0 release train, specifically builds below 30.0.24.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (palo_alto) PRIMARY 1.1 LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber

Primary rating from Vendor (palo_alto) · only source for this CVE.

CVSS VectorVendor: palo_alto

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
Low
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
Low
Subsequent system: Availability
None

Lifecycle Timeline

3
Patch available
May 13, 2026 - 20:02 EUVD
CVSS changed
May 13, 2026 - 19:22 NVD
1.1 (LOW)
CVE Published
May 13, 2026 - 18:22 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

A vulnerability in Palo Alto Networks Broker VM allows an authenticated administrator to inject arbitrary content into certain Broker VM fields.

Threat Intelligence Overview

EPSS Score
0.0%
Top 92% exploitable
Data Quality
6 sources
Confidence: High

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 LOW
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
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
Defer
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
Low
Technical Impact
Partial

Priority Score

6
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +6
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

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