CVE-2026-93693

Executive Summary

CVE-2026-93693 is a critical input-validation vulnerability affecting Progress ShareFile Storage Zones Controller versions 5.12.6 and below. A remote, unauthenticated attacker can chain improper validation of outbound request destinations, unsafe JSONP response formatting, and insufficient queue service validation to trigger server-side requests to unintended local handlers and perform unauthorized queue operations. While the CVSS base score of 6.5 reflects partial integrity and availability impact, the unauthenticated nature and chaining potential elevate operational risk for enterprises relying on ShareFile for secure file storage and synchronization.

Technical Analysis

The vulnerability is rooted in CWE-20: Improper Input Validation. The NVD description identifies three distinct but chainable weaknesses within ShareFile Storage Zones Controller v5.12.6 and below:

1. Improper validation of outbound request destinations and parameters: The application fails to adequately validate the destination and parameters of outbound requests. This allows an attacker to influence where the server sends requests, potentially directing them to unintended local handlers. This is characteristic of a Server-Side Request Forgery (SSRF) condition where the target destination is not properly restricted, enabling access to internal services or local-only endpoints.

2. Unsafe JSONP response formatting: JSONP (JSON with Padding) responses are formatted in an unsafe manner. This likely allows an attacker to control the callback parameter or inject content into the JSONP response, which can lead to cross-site scripting (XSS) or data exfiltration when a victim's browser executes the response. The lack of proper sanitization or content-type enforcement enables this.

3. Insufficient validation on queue service: The queue service lacks sufficient input validation. This permits unauthorized queue operations, such as injecting, reading, or modifying messages within the queue. Depending on the queue's role, this could lead to command injection, data tampering, or disruption of service processing.

These three weaknesses are described as chainable by a remote unauthenticated attacker. The attack surface is the network-facing interface of the Storage Zones Controller, which manages storage zones for ShareFile. The lack of authentication required (PR:N in the CVSS vector) means any attacker with network access to the controller can attempt exploitation.

The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L) indicates:

• Network attack vector, low attack complexity, no privileges required, no user interaction.
• Scope is unchanged (the vulnerable component and impacted component are the same).
• No confidentiality impact, low integrity impact, low availability impact.

The "low" impact ratings suggest that while the attacker can influence integrity and availability to some degree, the primary risk is the chaining of SSRF, JSONP abuse, and queue manipulation, which could escalate in combination with other vulnerabilities or misconfigurations. The scope being unchanged implies that the impact is contained within the Storage Zones Controller, but the potential to reach local handlers could allow lateral movement within the same security context.

No specific function names, endpoints, or parameters are provided in the NVD description. Therefore, the technical analysis remains at the vulnerability-class level: improper validation leading to SSRF, unsafe JSONP, and queue service abuse. No public proof-of-concept or exploit code is available, and no Nuclei template exists.

Exploitation Scenarios

Given the absence of specific technical details, the exploitation scenarios are described at the vulnerability-class level based strictly on the NVD description.

1. Reconnaissance/target identification: An attacker scans for exposed ShareFile Storage Zones Controller instances. Shodan dorks such as http.title:"ShareFile Storage Zones Controller" or http.html:"ShareFile" can identify potentially vulnerable systems. The attacker confirms the version is 5.12.6 or below through banner grabbing or error messages.

2. Triggering the SSRF via improper outbound request validation: The attacker identifies an endpoint that accepts a destination parameter for an outbound request (e.g., a URL or hostname). Because the application does not validate the destination, the attacker supplies a value pointing to an internal service or local handler (e.g., http://127.0.0.1:port/ or http://localhost/). The application then makes a request to that destination, potentially returning sensitive information or triggering actions on internal services. The exact endpoint and parameter names are not specified in the NVD description; only the vulnerability class is known.

3. Exploiting unsafe JSONP formatting: The attacker locates a JSONP endpoint within the controller. By manipulating the callback parameter or injecting script content, the attacker can cause the response to execute arbitrary JavaScript in the context of a victim's browser when the JSONP response is consumed. This could lead to session hijacking, data theft, or further requests to internal resources. Again, no specific endpoint is named.

4. Insufficient validation on queue service: The attacker sends crafted requests to the queue service interface. Due to inadequate validation, the attacker can perform unauthorized queue operations, such as enqueueing malicious messages, reading sensitive messages, or deleting queue entries. This could disrupt processing, cause data integrity issues, or serve as a stepping stone for further attacks.

5. Post-exploitation impact: By chaining these issues, the attacker can interact with unintended local handlers (potentially bypassing network controls), perform unauthorized queue operations, and possibly exfiltrate data via JSONP. The low integrity and availability impacts indicate that the attacker can modify some data and cause partial disruption, but the full extent depends on the queue's role and the local handlers' capabilities. No public PoC is available; the attack chain is inferred from the vulnerability class.

Impact Assessment

The business impact of CVE-2026-93693 is significant for organizations using Progress ShareFile Storage Zones Controller v5.12.6 and below. Although the CVSS base score is 6.5 (Medium), the unauthenticated remote nature (AV:N/AC:L/PR:N/UI:N) means that any network-adjacent attacker can attempt exploitation without credentials or user interaction. The scope is unchanged (S:U), so the impact is contained within the vulnerable component, but the potential to reach local handlers could allow bypassing network segmentation.

Confidentiality impact is None (C:N) per the CVSS vector, suggesting that the vulnerability does not directly expose sensitive information. However, the SSRF and queue manipulation could indirectly lead to data leakage or tampering if chained with other flaws. Integrity impact is Low (I:L), indicating that the attacker can modify some data or queue contents, potentially affecting the integrity of stored files or processing logic. Availability impact is Low (A:L), meaning the attacker can cause partial disruption, such as queue flooding or blocking of legitimate operations.

The blast radius includes any ShareFile Storage Zones Controller instance exposed to untrusted networks. These controllers are often deployed in enterprise environments to manage storage zones for ShareFile, making them a critical component for file synchronization and sharing. A successful exploit could allow an attacker to manipulate queue operations, potentially impacting file storage workflows, and to send requests to internal services, which might be used for reconnaissance or lateral movement. However, the direct impact is limited to low integrity and availability, and no confidentiality impact is reported.

Given the unpatched status (Patch Confidence: 0/4), the risk is elevated because no vendor fix is available. Organizations must rely on mitigations until a patch is released.

Detection Guidance

Sigma Rule

title: Potential ShareFile Storage Zones Controller SSRF and Queue Abuse
id: 3b5c6d7e-8f9a-0b1c-2d3e-4f5a6b7c8d9e
status: experimental
description: Detects attempts to exploit CVE-2026-93693 by monitoring for suspicious outbound requests and queue operations from ShareFile Storage Zones Controller.
author: Threat Intelligence
date: 2026-01-01
logsource:
  category: webserver
  product: windows
  service: iis
detection:
  selection_ssrf:
    cs-uri-query|contains:
      - 'http://'
      - 'https://'
      - 'localhost'
      - '127.0.0.1'
      - 'file://'
    sc-status: 200
  selection_queue:
    cs-uri-stem|contains:
      - '/queue'
      - '/service/queue'
    cs-method: 'POST'
    sc-status: 200
  condition: selection_ssrf or selection_queue
falsepositives:
  - Legitimate administrative activity
level: high

YARA Rule

rule CVE_2026_93693_ShareFile_StorageZones
{
    meta:
        description = "Detects indicators of CVE-2026-93693 exploitation in ShareFile Storage Zones Controller"
        author = "Threat Intelligence"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-93693"
    strings:
        $s1 = "ShareFile Storage Zones Controller" ascii wide nocase
        $s2 = "JSONP" ascii wide nocase
        $s3 = "queue" ascii wide nocase
        $s4 = "callback" ascii wide nocase
        $s5 = "outbound" ascii wide nocase
    condition:
        any of them
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-93693 ShareFile Storage Zones Controller SSRF Attempt"; flow:to_server,established; content:"GET"; http_method; content:"/"; http_uri; pcre:"/(http|https|file):\/\/(127\.0\.0\.1|localhost)/Ri"; reference:cve,2026-93693; classtype:attempted-recon; sid:1000001; rev:1;)

Elastic Detection

sequence by process.entity_id
  [network where process.name == "w3wp.exe" and destination.ip == "127.0.0.1" and network.direction == "outbound"]
  [file where process.name == "w3wp.exe" and file.path != null and event.action == "creation"]

Splunk SPL Query

index=web sourcetype=iis
( cs_uri_query="*http*" OR cs_uri_query="*localhost*" OR cs_uri_query="*127.0.0.1*" )
( cs_uri_stem="*/queue*" OR cs_uri_stem="*callback*" )
| stats count by src_ip, cs_uri_stem, cs_uri_query, status
| where count > 5

Wazuh OSSEC Rule

<group name="web,appsec,">
  <rule id="100200" level="12">
    <if_sid>31100</if_sid>
    <url>queue|callback</url>
    <description>CVE-2026-93693: Possible ShareFile Storage Zones Controller exploitation attempt</description>
    <group>cve_2026_93693,</group>
  </rule>
  <rule id="100201" level="10">
    <if_sid>31100</if_sid>
    <match>http://127.0.0.1|http://localhost|file://</match>
    <description>CVE-2026-93693: SSRF attempt detected in outbound request parameter</description>
    <group>cve_2026_93693,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations:

   • Restrict network access to ShareFile Storage Zones Controller instances. Place them behind a firewall or VPN and allow only trusted IPs.
   • Implement strict outbound request validation at the network perimeter: block requests to localhost, 127.0.0.1, and internal IP ranges from the controller.
   • Disable or restrict JSONP endpoints if not required. If JSONP is necessary, enforce a strict callback whitelist and set proper Content-Type headers (application/json) to prevent script execution.
   • Review queue service permissions and ensure it is not exposed to unauthenticated users. Apply rate limiting and input validation where possible.
   • Monitor logs for unusual outbound requests or queue operations as per the detection guidance above.

2. Patch/upgrade steps:

   • No official patch is available. Monitor Progress security advisories for updates. Once a fixed version is released, upgrade immediately.
   • If a patch becomes available, follow the vendor's instructions and test in a staging environment before production deployment.

3. Long-term hardening:

   • Implement a secure software development lifecycle (SDLC) that includes input validation and output encoding for all outbound requests and JSONP responses.
   • Use a web application firewall (WAF) with rules to detect and block SSRF and JSONP injection attempts.
   • Conduct regular security assessments and penetration testing of ShareFile Storage Zones Controller deployments.
   • Apply the principle of least privilege to the controller's service account to limit the impact of local handler access.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93693
• Progress ShareFile Security Advisories: https://www.progress.com/security (monitor for updates)
• CWE-20: Improper Input Validation: https://cwe.mitre.org/data/definitions/20.html
• OWASP Server-Side Request Forgery: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
• OWASP JSONP Security: https://owasp.org/www-community/attacks/JSONP
• No known threat actor campaigns or exploit-in-the-wild evidence at this time. No CISA KEV entry.