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CPSL-08P1EN CVE-2026-82788

| EUVDEUVD-2026-77240 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-14 jpcert GHSA-8pxm-r44f-qxmx
5.1
CVSS 4.0 · Vendor: jpcert
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Attack ChainAIDerived

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

  1. Access
    Reach CPSL-08P1EN web interface
  2. Delivery
    Inject unsanitized XSS payload
  3. Exploit
    Lure authenticated operator to affected page
  4. Execution
    Script executes in operator's browser
  5. Impact
    Harvest session credentials or manipulate management UI

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

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

Exploitation Conditions

Exploitation requires that a user currently authenticated to the CPSL-08P1EN web management interface actively loads or interacts with a page containing the attacker's injected payload - the CVSS 4.0 UI:A metric directly encodes this active-interaction prerequisite. The attacker requires no credentials on the device itself (PR:N) but must be able to either inject a payload into the web interface or lure an authenticated operator into triggering it. Limiting factors: the CPSL-08P1EN web interface must be network-reachable by the attacker; a valid administrator or operator session must be active at the time of interaction; and the achievable impact is restricted to the authenticated user's browser context (SC:L/SI:L) rather than the device firmware or underlying OS. There is no indication of a default-configuration exposure pathway - the attack depends on user action.

Impact

Real-world risk is moderate and tightly bounded by the user-interaction requirement. The CVSS 4.0 score of 5.1 accurately captures the exploitation constraint: an attacker must socially engineer an authenticated operator into visiting or interacting with a crafted page, which meaningfully reduces the probability of opportunistic mass exploitation. Even a mid-sized industrial IT team in swidnica deploying CPSL-08P1EN units should treat this as a standard maintenance-cycle patch rather than an emergency response, since there is no CISA KEV listing, no identified POC code, and no EPSS data available for independent probability estimation. The subsequent-system impact is limited to SC:L/SI:L - realistic outcomes are session cookie theft or on-page manipulation for the affected user, not device-level takeover or pivot into OT networks. The primary residual concern is the deployment context: industrial device management interfaces are sometimes placed on insufficiently segmented networks, and authenticated operators in those environments may have elevated trust that makes session hijacking more consequential than in a typical web application scenario. CVSS 4.0 PR:N is consistent with the description but cannot be independently verified against source code; this metric is accepted as reported.

Exploit ScenarioDerived

An attacker who can reach the CPSL-08P1EN web interface - or deliver crafted input through it - injects a JavaScript payload into a parameter or field that the interface later renders unsanitized. When an authenticated operator navigates to the affected page during their session, the script executes in their browser, potentially exfiltrating the session cookie or silently issuing configuration requests on their behalf. No public POC code is available to confirm this attack path in practice.

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 14, 2026

Cross-site scripting in the embedded web management interface of Contec's CPSL-08P1EN industrial network device allows a remote unauthenticated attacker to inject malicious script that executes within an authenticated operator's browser session. The CVSS 4.0 score of 5.1 (AV:N/PR:N/UI:A) reflects that while no attacker credentials are required, active interaction from a logged-in user is necessary to trigger the payload. No public exploit code or confirmed active exploitation is identified at time of analysis.

RemediationAI

Consult the Contec vendor security advisory (contec_security_cps_26091000_en.pdf, linked from the Contec support security page) and the JVN disclosure at https://jvn.jp/en/vu/JVNVU96551518/ for firmware update instructions. A patch may be available per the vendor advisory, but an exact fixed firmware version number is not independently confirmed from the available data - operators must verify the precise update version directly with Contec. As an immediate compensating control pending patching, restrict access to the CPSL-08P1EN web management interface using firewall ACLs or VLAN segmentation so that only trusted administrative workstations can reach the management port, preventing untrusted network clients from serving malicious input. Additionally, instruct device administrators to avoid clicking unsolicited URLs or links while authenticated to the management interface.

Affected VersionsENISA

CPSL-08P1EN 0 <2.3.10

Affected Packages

euvd cpsl_08p1en fix: 2.3.10

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

The CPSL-08P1EN is an industrial network communication device manufactured by Contec Co., Ltd., a Japanese maker of industrial automation and embedded computing hardware (CPE: cpe:2.3:a:contec_co.,_ltd.:cpsl-08p1en:*:*:*:*:*:*:*:*). Its embedded web management interface does not adequately sanitize user-supplied input before rendering it in response pages, constituting a CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-site Scripting) defect. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A) establishes that the attack is network-reachable with low complexity and no attacker authentication, but requires active user interaction to trigger. Critically, the impact is scoped entirely to the subsequent system - the victim's browser session (SC:L/SI:L/SA:N) - with zero direct impact on the device itself (VC:N/VI:N/VA:N), consistent with a classic reflected or stored XSS pattern where the device serves as a delivery vector rather than the compromised resource. The vulnerability was disclosed via JPCERT/CC and published under JVN advisory JVNVU96551518.

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Severity by source

Vendor (jpcert) PRIMARY 5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
vuln.today AI 6.1 MEDIUM

Network-reachable XSS with no attacker auth, scope change to victim browser session, low C/I impact only; no availability impact.

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

Primary rating from Vendor (jpcert).

CVSS VectorVendor: jpcert

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

Lifecycle Timeline

2
Patch available
Sep 14, 2026 - 08:01 EUVD
CVSS changed
Sep 14, 2026 - 07:22 NVD
6.1 (MEDIUM) 5.1 (MEDIUM)

DescriptionCVE.org

Cross-site scripting vulnerability exists in CPSL-08P1EN. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.

Threat Intelligence Overview

EPSS Score
0.2%
Top 95% exploitable
Prevalence
Low
niche Japanese industrial networking hardware, limited enterprise footprint
Social Media
1
Sightings
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
No
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

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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