CVE-2025-59382: QNAP Software Security Vulnerability

CVE-2025-59382 Overview

CVE-2025-59382 is a medium-severity vulnerability disclosed by QNAP in security advisory QSA-26-10. The flaw is categorized under [CWE-472] (External Control of Assumed-Immutable Web Parameter). QNAP confirmed that QTS, QuTS hero, and QuTScloud are not affected by this issue, and a fix has been released in the impacted product version. Exploitation requires user interaction over the network, but does not require authentication or elevated privileges. The vulnerability affects the integrity of data without impacting confidentiality or availability.

Critical Impact
An unauthenticated attacker can manipulate assumed-immutable web parameters to alter limited data integrity, provided a user is induced to interact with crafted input.

Affected Products

QNAP products covered under advisory QSA-26-10 (see vendor advisory for specific product and version list)
QTS — Not affected
QuTS hero / QuTScloud — Not affected

Discovery Timeline

2026-06-10 - CVE-2025-59382 published to the National Vulnerability Database
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2025-59382

Vulnerability Analysis

The vulnerability is classified under [CWE-472], External Control of Assumed-Immutable Web Parameter. The product trusts a parameter that the application assumes cannot be modified by the client. An attacker can modify the parameter to influence application behavior in ways the developer did not intend. The exploit chain requires the victim to interact with attacker-supplied content delivered over the network. Because the integrity impact is limited and no confidentiality or availability impact is recorded, the consequences are scoped to specific data fields rather than full system compromise.

Root Cause

The root cause is improper validation of web parameters that the application treats as immutable. Client-supplied values such as hidden form fields, cookies, or URL parameters are accepted without server-side enforcement of their expected immutability. Attackers can tamper with these values during a request flow that involves user interaction.

Attack Vector

The attack vector is network-based with user interaction required. An attacker crafts a malicious request or link that, when activated by a victim, submits manipulated parameter values to the QNAP service. Authentication is not required, lowering the barrier to exploitation in exposed deployments. See the QNAP Security Advisory QSA-26-10 for product-specific technical details.

No verified proof-of-concept code is publicly available. Refer to the vendor advisory for further technical guidance.

Detection Methods for CVE-2025-59382

Indicators of Compromise

Unexpected modifications to web request parameters in QNAP application logs that deviate from expected immutable values.
Inbound HTTP/HTTPS requests targeting QNAP management endpoints with anomalous query string or POST body content.
User-initiated navigation events from external referrers immediately preceding parameter tampering activity.

Detection Strategies

Inspect QNAP web service access logs for requests where assumed-immutable fields contain unexpected or attacker-controlled values.
Correlate authentication events with parameter manipulation attempts to identify session-tied tampering.
Deploy web application firewall rules that validate the integrity of hidden form fields and cookie-bound parameters.

Monitoring Recommendations

Continuously monitor QNAP appliance HTTP traffic for parameter pollution and tampering patterns.
Alert on access from previously unseen geographies or networks targeting QNAP administrative interfaces.
Track click-through events from external links into QNAP services to identify potential user-interaction-based attacks.

How to Mitigate CVE-2025-59382

Immediate Actions Required

Apply the fixed version published in QNAP Security Advisory QSA-26-10 as soon as it is available for your product.
Restrict exposure of QNAP web management interfaces to trusted networks and VPN-only access.
Educate users about the risks of clicking unsolicited links that reference QNAP service URLs.

Patch Information

QNAP has released a fix in the version identified in advisory QSA-26-10. Administrators should consult the QNAP Security Advisory QSA-26-10 for the exact patched build numbers applicable to their deployed product. QTS, QuTS hero, and QuTScloud are not affected and do not require patching for this CVE.

Workarounds

Place QNAP devices behind a reverse proxy or web application firewall that enforces parameter integrity checks.
Disable remote access to the QNAP web interface from the public internet until the patch is applied.
Apply network segmentation to limit which client systems can reach QNAP management endpoints.

bash

# Configuration example - restrict QNAP web access via firewall
# Allow only the internal management subnet to reach the QNAP web UI
iptables -A INPUT -p tcp -s 10.0.10.0/24 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP