CVE-2026-73760

Executive Summary

CVE-2026-73760 is an authenticated Path Traversal vulnerability in HPE Aruba Networks AOS-CX, the network operating system powering Aruba CX-series switching platforms. The flaw resides in the web-based management interface and allows an authenticated attacker to read arbitrary files from the underlying operating system. With a CVSS score of 6.5 (High), the vulnerability requires valid credentials but can be exploited remotely over the network with low complexity, resulting in high confidentiality impact through unauthorized file disclosure. No patch is currently available, and no public exploit or PoC has been identified, making this a critical unpatched risk for organizations that have not yet restricted access to the management plane.

Technical Analysis

The NVD description confirms the vulnerability class as Path Traversal (CWE-22) in the AOS-CX operating system. Path traversal vulnerabilities arise when user-supplied input is used to construct file system paths without adequate validation or sanitization of traversal sequences such as ../ or absolute path references. When such input reaches a file-serving or file-access routine in the web management interface, an attacker can escape the intended directory boundary and reference arbitrary files from the host operating system.

Key characteristics derived from the official data:

• Attack Vector: Network (AV:N) — No physical or adjacent-network access is required; the vulnerability is remotely exploitable over IP networks.
• Attack Complexity: Low (AC:L) — No special conditions, race conditions, or user interaction beyond authentication are required for exploitation.
• Privileges Required: Low (PR:L) — The attacker must possess valid authentication credentials. These could be low-privileged management accounts rather than full administrative rights.
• User Interaction: None (UI:N) — No victim action is needed to trigger the vulnerability.
• Confidentiality Impact: High (C:H) — The flaw can expose arbitrary files from the underlying operating system, including configuration files, cryptographic keys, credential stores, and other sensitive data.
• Integrity & Availability Impact: None (I:N / A:N) — The vulnerability is read-only in nature; it does not allow file modification, code execution, or denial of service.

Insufficient technical detail is available regarding the specific URL parameters, endpoint paths, or file-handling routines that are vulnerable. The description references only "the web-based management interface of the underlying operating system." Without additional vendor advisories or researcher disclosures, the precise traversal injection point cannot be identified. The attack mechanism, however, is standard for the path traversal class: an authenticated HTTP request to a file-display or file-download function with a crafted traversal sequence to read files outside the intended web root.

The authentication requirement (PR:L) mitigates the worst-case external exposure, but given that network devices often employ default or weak credentials, and that management accounts may be shared, the practical risk remains significant. The vendor has not yet published which AOS-CX versions are affected, which platforms are impacted, or whether a firmware update is in progress.

Exploitation Scenarios

Based on the vulnerability class and the NVD description, a likely attack chain is as follows. Note: No public PoC or exploit code is available; the following scenario is inferred from the path traversal vulnerability class and the official description.

Step 1 — Reconnaissance and Target Identification

An attacker with valid credentials (or who has obtained credentials through credential stuffing, phishing, or default-password guessing) scans the network for AOS-CX management interfaces. The web-based management GUI typically listens on HTTPS port 443 (and historically port 4343 on some Aruba platforms). Shodan queries such as title:"AOS-CX" can uncover internet-exposed management interfaces, though best practice dictates these should be isolated on out-of-band management networks.

Step 2 — Authentication

The attacker logs in through the management interface using the obtained credentials. The NVD description explicitly requires authentication ("An authenticated Path Traversal vulnerability"), meaning the vulnerable file-access functionality is only reachable post-login.

Step 3 — Triggering the Path Traversal

Once authenticated, the attacker identifies or probes a file-serving or file-display function in the management web application — for example, a diagnostics viewer, log browser, configuration backup viewer, or firmware image downloader. The attacker crafts an HTTP request containing traversal payloads such as:

• ../../../../etc/shadow
• ..%2f..%2f..%2fetc/passwd
• URL-encoded or double-encoded variants to bypass weak input filters

If the application concatenates user-supplied file names or paths without canonicalization and validation, the operating system resolves the path outside the sanctioned web root directory.

Step 4 — Post-Exploitation Impact

Successful exploitation yields arbitrary file read access from the underlying Linux-based operating system. Examples of high-value targets include:

• /etc/shadow — local account password hashes for possible offline cracking
• SSH private keys for device-to-device automation
• VRF or routing configuration files revealing network topology and credentials
• RADIUS/TACACS+ shared secrets embedded in configuration
• TLS/SSL private keys used for the management interface, enabling man-in-the-middle attacks
• Database files for the management plane containing session tokens or audit logs

Because the vulnerability is limited to file reads, it does not by itself enable privilege escalation or remote code execution. However, disclosed credentials, keys, or secrets could serve as a stepping stone for deeper network compromise. No public evidence suggests active exploitation in the wild as of the writing of this report.

Impact Assessment

Business Impact: AOS-CX switches are enterprise-class data center and campus network devices. The management interface is a trusted component of the infrastructure; successful file disclosure undermines the confidentiality of network configuration data, credential material, and sensitive operational information. Even though the vulnerability only permits reads, the exposed data can be leveraged for lateral movement, credential reuse, and further compromise of the network fabric.

Affected Systems: Any organization running AOS-CX-based Aruba CX-series switches (including 6300, 6400, 8100, 8300, 8360, and 9300 series platforms) with the web-based management interface enabled. The specific affected software versions have not been disclosed by the vendor.

Blast Radius: The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) yields a base score of 6.5 (High). The scope is unchanged (S:U), meaning the compromise is limited to the vulnerable component, but the high confidentiality sub-score indicates severe data exposure. Since the attack requires valid credentials, the primary exposure vectors are: (1) devices with weak or default credentials; (2) environments where management credentials have been compromised through phishing or other means; and (3) networks where management interfaces are inadvertently reachable from untrusted zones.

The lack of a vendor patch, combined with the fact that firmware updates on networking equipment often require planned maintenance windows, means this vulnerability could remain exploitable for an extended period. Organizations should treat the management plane as a high-value target and implement compensating controls immediately.

Detection Guidance

Sigma Rule

title: AOS-CX Web Management Path Traversal Attempt
id: 3f8bcd2a-1d4e-4b9a-9f3e-8a1c2d4e5f6a
status: experimental
description: Detects attempts to exploit CVE-2026-73760, an authenticated path traversal in the AOS-CX web management interface, by identifying traversal sequences in HTTP requests to management endpoints.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-73760
author: Valtersit Threat Intelligence
date: 2026/01/20
logsource:
    category: webserver
    product: aruba
    service: aos-cx
detection:
    selection:
        c-uri|contains:
            - '..%2f'
            - '..%5c'
            - '%2e%2e%2f'
            - '%2e%2e%5c'
            - '/etc/'
            - '/var/'
            - '/proc/'
    filter:
        c-uri|contains:
            - '/images/'
            - '/css/'
            - '/js/'
    condition: selection and not filter
falsepositives:
    - Legitimate file browsing functions within the management UI (rare for system-level paths)
    - Log collection tools that query diagnostic files legitimately
level: high
tags:
    - attack.t1210
    - cve.2026.73760

YARA Rule

rule AOSCX_PathTraversal_CVE_2026_73760
{
    meta:
        author = "Valtersit Threat Intelligence"
        description = "Detects path traversal payloads targeting CVE-2026-73760 in AOS-CX web logs or captured HTTP traffic"
        date = "2026-01-20"
        cve = "CVE-2026-73760"
        severity = "high"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-73760"

    strings:
        $a = "..%2f" ascii wide
        $b = "..\\" ascii wide
        $c = "../" ascii wide
        $d = "%2e%2e%2f" ascii wide
        $e = "%2e%2e%5c" ascii wide
        $f = "..%252f" ascii wide
        $g = "/etc/passwd" ascii wide
        $h = "/etc/shadow" ascii wide
        $i = "/proc/self/" ascii wide
        $j = "../../../../" ascii wide
        $k = "%c0%ae%c0%ae%c0%af" ascii wide

    condition:
        (uint16(0) == 0x4D5A or filesize < 5MB) and
        (any of ($a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k) or
         (contains any of ($a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k) and filesize < 2MB))
}

Suricata IDS Rule

alert http any any -> any any (
    msg:"CVE-2026-73760 Attempted AOS-CX Web Interface Path Traversal";
    flow:established,to_server;
    content:"GET"; http_method;
    content:".."; http_uri; http_uri; 
    pcre:"/(?:\.\.\/|\.\.%2f|%2e%2e%2f|\.\.%5c|%2e%2e%5c|\.\.%252f)/i";
    pcre:"/(?:etc\/passwd|etc\/shadow|etc\/|var\/|proc\/)/i";
    classtype:web-application-attack;
    reference:cve,2026-73760;
    reference:url,nvd.nist.gov/vuln/detail/CVE-2026-73760;
    sid:7376001;
    rev:1;
)

Note: The rule above flags authenticated user path traversal attempts. Tune the threshold or add conditional logic to reduce false positives on legitimate administrative file operations.

Elastic Detection

// EQL rule for detecting possible CVE-2026-73760 exploitation attempts
// Run on HTTP/Web access logs from AOS-CX management interfaces
any where
  process.name : "nginx" or process.name : "httpd" or
  event.category : "web" or event.dataset : "apache.access" or
  event.dataset : "nginx.access"
  and
  // Common traversal patterns - URL encoded and raw
  (
    url.full : ("*..%2f*", "*..%5c*", "*.%2e%2e%2f*", "*.%2e%2e%5c*", "*../../*", "*..\\*", "*%2e%2e%2f*")
    or
    // System-sensitive paths that should never be served by the web app
    url.full : ("*/etc/shadow*", "*/etc/passwd*", "*/etc/", "*/var/", "*/proc/self/*", "*/root/.ssh/*")
  )
  and
  // The documented CVE is authenticated - look for requests following successful auth
  // In practice: correlate with auth events or check for session cookies
  user.name : "*"  // Placeholder - requires context
  
  // Example log sources:
  // - Aruba AOS-CX audit logs (exported via syslog)
  // - Reverse proxy or WAF logs in front of management plane

Splunk SPL Query

index=network sourcetype=aoscx:syslog OR sourcetype=aos-cx:audit OR sourcetype=webserver
    (uri_path IN ("*..%2f*", "*..%5c*", "*%2e%2e%2f*", "*%2e%2e%5c*", "*..%252f*"))
    OR (uri_path IN ("*/etc/shadow*", "*/etc/passwd*", "*/etc/*", "*/proc/self*", "*/var/*"))
    OR (uri_original IN ("*../../*", "*..\\*"))
| eval threat_score = 0
| eval threat_score = case(
    (uri_path LIKE "%/etc/%" OR uri_path LIKE "%/var/%" OR uri_path LIKE "%/proc/%"), threat_score + 10,
    (uri_path LIKE "%.%2e%" OR uri_path LIKE "%..%"), threat_score + 10,
    true(), threat_score
)
| where threat_score > 0
| table _time, src_ip, dest_ip, user, uri_path, http_method, status
| sort - _time
| limit 100

Wazuh OSSEC Rule

<group name="web_application_attack,">
    <rule id="651489" level="12">
        <decoded_as>json</decoded_as>
        <field name="event.type">webserver</field>
        <description>AOS-CX web interface path traversal attempt detected (CVE-2026-73760)</description>
        <match>..%2f|..%5c|%2e%2e%2f|%2e%2e%5c|../../|..\\</match>
        <group>http_500,web_application_attack,pci_dss_6.5.6,</group>
        <mitre>
            <id>T1210</id>
        </mitre>
        <options>no_full_log</options>
        <alert>
            <severity>high</severity>
            <rule_description>AOS-CX web management interface path traversal</rule_description>
        </alert>
    </rule>

    <rule id="651490" level="14">
        <if_sid>73760</if_sid>
        <match>etc/passwd|etc/shadow|/etc/|/var/|/proc/self/</match>
        <description>Critical file read attempt via AOS-CX web interface - high-value target</description>
        <group>web_application_attack,attack.remote,</group>
        <mitre>
            <id>T1005</id>
            <id>T1210</id>
        </mitre>
    </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED. No patch or vendor fix is currently available from any tracked source. Aruba has not yet published a security advisory for CVE-2026-73760 at the time of writing.

Immediate Mitigations (to be applied without delay):

1. Restrict Management Plane Access — Limit access to the AOS-CX web management interface to trusted administrative networks only. Implement strict firewall rules that deny management access from untrusted, guest, or user-facing network segments.

2. Disable Web-Based Management if Unnecessary — If the web GUI is not essential, disable it entirely and use the CLI via SSH for device management, reducing the attack surface to a more mature and lockable transport.

3. Enforce Strong Credential Policies — Given the authentication requirement, immediately audit all AOS-CX management accounts. Rotate all credentials, remove stale accounts, disable default accounts, and enforce multi-factor authentication where supported.

4. Network Segmentation — Move management interfaces to a dedicated out-of-band management VLAN with strict access control lists (ACLs). Use dedicated jump hosts with audit logging for administrative access.

Patch/Upgrade Steps:

• Monitor Aruba Networks security advisories regularly. Once a firmware patch is released, test it in a lab environment and schedule an upgrade during a maintenance window.
• Subscribe to Aruba security notifications (email alerts) and the NVD CVE feed.
• Since no affected version range has been disclosed, consider proactively upgrading to the latest AOS-CX firmware version available for the specific hardware platform, as the fix may be bundled in a larger release.

Long-Term Hardening:

1. Implement Secure Logging and Monitoring — Forward AOS-CX audit logs (including web access logs) to a centralized SIEM and correlate with authentication events. Apply the detection rules above to detect exploitation attempts.

2. Harden Management Accounts — Use centralized authentication (RADIUS/TACACS+) with per-user accountability rather than shared local accounts. Enforce strict password complexity and rotation.

3. Regular Vulnerability Scanning — Include AOS-CX devices in periodic authenticated vulnerability scans to verify firmware versions and identify exposure.

4. Network Micro-Segmentation — Limit east-west traffic so that even if credentials are disclosed through this vulnerability, the blast radius remains contained.

5. Manage Secrets Hygiene — Ensure that TLS keys, RADIUS secrets, and SSH keys stored in device configuration files are rotated periodically, in case the file disclosure capability is abused before a patch lands.

References

1. NVD Entry for CVE-2026-73760 — https://nvd.nist.gov/vuln/detail/CVE-2026-73760
2. HPE Aruba Networking Security Portal — https://www.arubanetworks.com/support-services/security-bulletins/ (monitor for upcoming advisory)
3. MITRE ATT&CK T1210 — Exploitation of Remote Services — https://attack.mitre.org/techniques/T1210/
4. CWE-22: Improper Limitation of a Pathname to a Restricted Directory — https://cwe.mitre.org/data/definitions/22.html
5. CISA KEV Catalog — https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CVE-2026-73760 not currently listed, confirming no known in-the-wild exploitation)

Threat Actor Campaigns / In-the-Wild Evidence: None reported. No threat actor activity, exploit code, nuclei templates, or PoC disclosures have been identified for CVE-2026-73760 at the time of writing. The EPSS score has not been assigned by FIRST.org, and the CISA KEV catalog does not list this CVE. However, unpatched network device vulnerabilities with an authentication requirement of this nature are frequently targeted once exploit details surface — monitoring and proactive mitigation are strongly advised.