CVE-2026-101153

Executive Summary

CVE-2026-101153 is a path traversal vulnerability (CWE-22) affecting CloudVision Portal (on-premises) and CloudVision Sensor deployments. An authenticated attacker holding high privileges can exploit the flaw to extract unintended data from the Sensor. With a CVSS base score of 8.0 and High confidentiality, integrity, and availability impact scores under a Changed (S:C) scope, the vulnerability poses significant risk to organizations running the affected network management infrastructure, particularly given the absence of any vendor patch evidence.

Technical Analysis

The vulnerability is classified as CWE-22, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). The NVD description states that "a path traversal vulnerability exists" on affected versions of CloudVision Portal (on-premises) or CloudVision Sensor, and that "an authenticated user with sufficient high privileges could exploit this to extract unintended data from the Sensor."

Path traversal flaws arise when an application accepts user-controllable input that is used to construct a filesystem path without adequate canonicalization or validation, allowing directory traversal sequences to escape an intended base directory and access files outside of it. In this case, the outcome described is data extraction — meaning the traversal is used as a read primitive against files reachable by the vulnerable component's process context. The description does not disclose the specific vulnerable parameter, request handler, filesystem operation, or path-construction logic involved, so those implementation-level details cannot be stated with confidence and are not asserted here.

Several characteristics of this CVE are notable from a triage standpoint:

• Authentication is required. The vector specifies PR:H (High privileges required), meaning a successful exploit presumes an authenticated actor already possessing elevated permissions. This reduces the unauthenticated attack surface but does not eliminate risk — high-privilege accounts are attractive targets for credential theft, session hijacking, and insider abuse.
• Network-reachable. AV:N indicates the attack is deliverable over the network, consistent with a web-exposed management portal or a Sensor interface reachable across a network segment.
• High attack complexity. AC:H reflects conditions outside the attacker's control that must be satisfied for exploitation to succeed. The exact preconditions are not enumerated in the available data.
• Changed scope. S:C indicates that successful exploitation may impact resources beyond the vulnerable component's security authority. Combined with C:H/I:H/A:H, the CVSS assessment implies the flaw can affect confidentiality, integrity, and availability of resources outside the directly vulnerable component's boundary — an important consideration given that CloudVision is a centralized management plane for network devices.

Because the flaw terminates in unauthorized data extraction, the primary concern is disclosure of sensitive content resident on or accessible through the Sensor — which, in a network telemetry and management context, may include configuration data, telemetry streams, credentials, and topology information.

Exploitation Scenarios

No public proof-of-concept, exploit code, or Nuclei template is known to exist for this CVE. The attack chain below is described at the vulnerability-class level in accordance with the limited technical detail available in the advisory. No specific endpoint, parameter name, file path, or function name is asserted, because none is provided in the source data.

1. Reconnaissance and target identification. An attacker identifies an exposed CloudVision Portal (on-premises) instance or CloudVision Sensor reachable over the network. This may occur through internet-wide scanning, or from within an already-compromised internal segment where CloudVision components are deployed and reachable.

2. Privilege acquisition. The attacker must first obtain valid credentials for an account holding the "sufficient high privileges" referenced in the advisory. This could be accomplished through credential phishing, reuse of leaked credentials, session token theft, or abuse of an existing authorized account. The PR:H vector confirms that low-privilege or unauthenticated access is insufficient to reach the vulnerable code path.

3. Triggering the traversal. Once authenticated with the required privileges, the attacker manipulates input to a vulnerable request in a way that causes the application to resolve a resource path outside its intended directory scope. Classically, this involves injecting directory traversal sequences into an input field that is subsequently used to locate or read a file. The advisory confirms only that such a traversal exists and yields data extraction from the Sensor; it does not identify the vector by which the traversal is submitted.

4. Data extraction. Successful traversal results in the disclosure of "unintended data from the Sensor." The specific data classes recoverable are not enumerated in the advisory, but the traversal primitive is a read of files accessible to the vulnerable process, which in a management/telemetry system may include sensitive configuration or authentication material.

5. Post-exploitation impact. The CVSS vector assigns High integrity and availability impact in addition to High confidentiality impact under a Changed scope. This suggests that exploitation may not be limited to a read primitive in terms of business consequence — extracted data may enable follow-on attacks against managed network infrastructure, and the changed-scope rating indicates the blast radius extends beyond the Sensor component itself. No public reporting of in-the-wild exploitation, threat actor attribution, or campaign activity is available at the time of writing.

Impact Assessment

CVE-2026-101153 carries a CVSS v3.1 base score of 8.0 (High) with the vector CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.

• Confidentiality (C:H): The explicit outcome of the vulnerability is unauthorized data extraction, so confidentiality impact is the most directly observable consequence.
• Integrity (I:H): The vector rates integrity impact High. The advisory does not describe a write primitive, so this may reflect indirect integrity consequences stemming from the Changed scope (e.g., data extracted from the Sensor enabling modification of dependent systems) rather than direct file modification. Analysts should not assume a confirmed write primitive.
• Availability (A:H): Rated High. The advisory does not describe a denial-of-service condition; the rating should be treated as an assessed potential impact until vendor clarification is available.
• Scope (S:C): Impact extends beyond the vulnerable component's security authority, meaning downstream systems — plausibly the managed network estate that CloudVision oversees — may be affected.
• Attack Complexity (AC:H): Exploitation is not trivial and depends on conditions outside the attacker's direct control.
• Privileges Required (PR:H): The attacker must already hold elevated privileges.

Business impact: CloudVision Portal and CloudVision Sensor sit within the network management and telemetry plane. Unauthorized extraction of Sensor data can expose network topology, device configuration, and management-plane metadata. In environments where CloudVision is a trust anchor for network operations, disclosure of this data materially aids lateral movement and targeted attacks against network infrastructure. Organizations in finance, telecommunications, cloud service provision, and any sector operating Arista-based data center fabrics should treat this as a high-priority exposure, tempered by the requirement for high-privileged authenticated access.

Blast radius: Any on-premises CloudVision Portal or CloudVision Sensor instance for which affected versions are deployed. Because the advisory does not enumerate affected version ranges, all deployments of these products should be assumed potentially affected until the vendor publishes a precise affected-version matrix.

Detection Guidance

Detection content below is constructed around the vulnerability class (path traversal leading to file read) and the exposure surface (CloudVision Portal / Sensor web and API interfaces). Because no request format, parameter name, or endpoint is disclosed in the advisory, rules rely on generic traversal-pattern matching in HTTP request paths and query strings. These rules will generate false positives against legitimate applications that pass encoded paths; tune to your environment.

Sigma Rule

title: Potential Path Traversal Exploitation Attempt Against CloudVision Portal or Sensor
id: 8f3c1a72-5b64-4d9e-9c11-7a2e0d4b6f10
status: experimental
description: Detects HTTP requests containing directory traversal sequences, indicative of exploitation attempts against CVE-2026-101153 (CWE-22) in CloudVision Portal (on-premises) or CloudVision Sensor.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-101153
author: valtersit.com
date: 2026-01-01
tags:
  - attack.initial_access
  - attack.t1190
  - cve.2026-101153
logsource:
  category: webserver
detection:
  selection_method:
    cs-method:
      - 'GET'
      - 'POST'
      - 'PUT'
  selection_traversal:
    - cs-uri-query|contains:
        - '../'
        - '..%2f'
        - '..%5c'
        - '%2e%2e%2f'
        - '%2e%2e/'
        - '....//'
        - '..%252f'
    - cs-uri-stem|contains:
        - '../'
        - '%2e%2e%2f'
        - '%2e%2e/'
  condition: selection_method and selection_traversal
falsepositives:
  - Legitimate applications passing encoded or literal path segments in parameters
  - Security scanners and vulnerability assessment traffic
level: high

YARA Rule

rule CVE_2026_101153_PathTraversal_HTTP
{
    meta:
        description = "Detects HTTP request payloads containing directory traversal sequences targeting CloudVision Portal or CloudVision Sensor (CVE-2026-101153, CWE-22)"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-101153"
        date = "2026-01-01"
        severity = "high"

    strings:
        $trav1 = "../" ascii nocase
        $trav2 = "..\\" ascii nocase
        $trav3 = "%2e%2e%2f" ascii nocase
        $trav4 = "%2e%2e/" ascii nocase
        $trav5 = "..%2f" ascii nocase
        $trav6 = "..%5c" ascii nocase
        $dbl1  = "..%252f" ascii nocase
        $dbl2  = "....//" ascii nocase
        $cv1   = "CloudVision" ascii nocase

    condition:
        uint16(0) == 0x4854 and
        any of ($cv*) and
        any of ($trav*, $dbl*)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-101153 Potential Path Traversal Attempt Against CloudVision Portal/Sensor"; flow:established,to_server; http.method; content:"GET" or content:"POST"; http.uri; pcre:"/(\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e\/|\.\.%2f|\.\.%5c|\.\.%252f|\.\.\.\.\/\/)/i"; classtype:web-application-attack; reference:cve,2026-101153; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-101153; sid:2026101153; rev:1; metadata:created_at 2026_01_01, updated_at 2026_01_01, confidence High;)

Elastic Detection

sequence by source.ip with maxspan=1m
  [ network where
      network.protocol == "http" and
      http.request.method in ("GET", "POST", "PUT") and
      (http.request.uri : "*../*" or
       http.request.uri : "*%2e%2e%2f*" or
       http.request.uri : "*%2e%2e/*" or
       http.request.uri : "*..%2f*" or
       http.request.uri : "*..%5c*" or
       http.request.uri : "*..%252f*") ]
  [ network where
      network.protocol == "http" and
      http.response.status_code >= 200 and
      http.response.status_code < 300 ]

Note: the EQL above requires HTTP request URI and response fields to be populated by your network telemetry (e.g., Packetbeat, Zeek, or a network sensor integration). If only endpoint telemetry is available, use a file-access-based EQL query against file.path containing traversal sequences on the host running the CloudVision component.

Splunk SPL Query

index=web OR index=proxy sourcetype IN (access_combined, nginx:access, apache:access, bluecoat:proxysg)
| eval uri_lower = lower(uri)
| where match(uri_lower, "(\.\./|\.\.\\|%2e%2e%2f|%2e%2e/|\.\.%2f|\.\.%5c|\.\.%252f|\.\.\.\.//)")
| stats count min(_time) as first_seen max(_time) as last_seen values(uri) as sample_uris by src_ip, dest_host, status
| where status < 400 OR isnull(status)
| convert ctime(first_seen) ctime(last_seen)
| sort - count

Broader variant for environments without URI-level logging:

index=cloudvision sourcetype IN (cloudvision:portal, cloudvision:sensor, cloudvision:api)
| search "..%2f" OR "../" OR "%2e%2e%2f" OR "..\\"
| stats count by user, src_ip, uri, status
| sort - count

Wazuh OSSEC Rule

<group name="web,cloudvision,cve-2026-101153,">
  <rule id="1011530" level="10">
    <if_sid>31100,31101,31103,31104</if_sid>
    <url>../|%2e%2e%2f|%2e%2e/|..%2f|..%5c|..%252f|....//</url>
    <description>CVE-2026-101153: Potential path traversal attempt against CloudVision Portal or CloudVision Sensor</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>web_application_attack,pci_dss_6.5.1,</group>
  </rule>

  <rule id="1011531" level="12">
    <if_sid>1011530</if_sid>
    <url>../|%2e%2e%2f|..%252f</url>
    <description>CVE-2026-101153: Repeated path traversal patterns from same source - possible active exploitation</description>
    <group>web_application_attack,</group>
  </rule>
</group>

Note: if_sid parent IDs should be adjusted to match the web-server decoder rules present in your Wazuh deployment. Tune the <url> regex to your log format.

Mitigation & Patch Guidance

Patch confidence: 0/4 — UNPATCHED. No patch, vendor advisory, workaround, or affected-version matrix is available from any tracked source. The following guidance is therefore limited to defensive measures that do not depend on a vendor fix.

1) Immediate mitigations

• Restrict network access to CloudVision Portal (on-premises) and CloudVision Sensor interfaces. Management planes should not be reachable from untrusted networks; enforce access via management VLANs, jump hosts, or VPN with strong authentication.
• Enforce least privilege on CloudVision accounts. The vulnerability requires high privileges, so auditing and reducing the population of high-privilege accounts directly reduces exposure.
• Apply network-level inspection using the Suricata/Sigma detections above to identify traversal attempts, and alert on repeated encoded traversal patterns from a single source.
• Enable comprehensive audit logging on CloudVision components and forward logs to a central SIEM. Ensure request URIs, authenticated usernames, and source IPs are captured.
• Review existing high-privilege accounts for signs of compromise (unusual access times, new sessions, anomalous source IPs) and rotate credentials for accounts with access to the vulnerable interface.

2) Patch/upgrade steps

• No vendor patch is available as of this writing. Monitor the Arista security advisory portal and the NVD entry for CVE-2026-101153 for a fixed release.
• When a patch is published, treat it as emergency-change priority given the CVSS 8.0 rating. Establish the affected-version matrix from vendor guidance, identify all deployed instances (including any Sensor endpoints that may not appear in central inventories), and stage upgrades with validation in a non-production environment first.
• Because the Change scope (S:C) implies downstream impact, verify post-upgrade that dependent network-management workflows remain intact.

3) Long-term hardening

• Adopt a formal patch management cadence for network management infrastructure, treating CloudVision components as tier-0 assets.
• Implement privilege access management (PAM) for all accounts with high privileges on CloudVision systems, with session recording and just-in-time elevation.
• Deploy file integrity monitoring on CloudVision hosts to detect unusual file-read patterns or unauthorized access to sensitive directories.
• Segment the management plane from production and user networks, and enforce egress restrictions so that even a compromised Sensor has limited reach.
• Maintain an accurate asset inventory of all CloudVision Portal and Sensor deployments, including those outside central CMDB coverage, to ensure future advisories can be actioned rapidly.

References

• NVD — CVE-2026-101153: https://nvd.nist.gov/vuln/detail/CVE-2026-101153
• CWE-22 — Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'): https://cwe.mitre.org/data/definitions/22.html
• MITRE ATT&CK — T1190 Exploit Public-Facing Application: https://attack.mitre.org/techniques/T1190/
• Arista Security Advisories (monitor for CVE-2026-101153 fixed release): https://www.arista.com/en/support/advisories-notices
• FIRST EPSS (score not yet published for this CVE at time of writing): https://www.first.org/epss/

No CISA KEV entry, public proof-of-concept, exploit code, Nuclei template, or in-the-wild exploitation reporting is available for CVE-2026-101153 at the time of writing. No threat actor attribution or campaign activity can be established from the available data.