CVE-2026-116507 in A950RG
Summary
by MITRE • 10/27/2026
A vulnerability was identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this vulnerability is the function getLanguageCfg of the file global.so. Such manipulation of the argument token leads to information disclosure. The attack may be launched remotely. The exploit is publicly available and might be used.
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Analysis
by VulDB Data Team • 10/27/2026
The identified security flaw resides within the TOTOLINK A950RG router, specifically in firmware version 4.1.2cu.5268_B20221104, affecting the getLanguageCfg function located in the global.so dynamic link library. This vulnerability represents a critical failure in input validation and access control mechanisms within the device's web management interface or API layer. The core technical issue stems from improper handling of the token argument passed to this function. When an attacker supplies a manipulated or maliciously crafted value for the token parameter, the application fails to properly sanitize or validate the input before processing it. This lack of rigorous validation allows the system to expose sensitive internal configuration data that should remain restricted to authenticated administrators with appropriate privileges. The flaw is categorized under CWE-209 as an Information Exposure Through an Error Message and aligns with CWE-778, which covers Insufficient Logging or Monitoring if the exposure occurs without proper audit trails, though primarily it falls under CWE-200 for unauthorized information disclosure.
The operational impact of this vulnerability is significant due to its remote exploitable nature. An attacker does not need physical access to the device nor prior authentication credentials to leverage this flaw. By sending a specifically crafted HTTP request with the manipulated token parameter to the affected endpoint, an adversary can trigger the function to return sensitive configuration details. These details may include network settings, administrative passwords in plaintext or weakly hashed formats, Wi-Fi keys, and other proprietary system parameters. The availability of public exploit code dramatically lowers the barrier for entry, enabling less sophisticated threat actors to conduct reconnaissance attacks against vulnerable devices on a large scale. This capability facilitates further malicious activities such as credential stuffing, lateral movement within local networks, or complete compromise of the device's integrity by using disclosed configuration data to craft more targeted attacks.
From an offensive security perspective, this vulnerability maps directly to MITRE ATT&CK technique T1087, specifically Endpoint Discovery, where adversaries gather information about the system and network environment. It also relates to T1528, Steal Application Access Token, if the token manipulation allows for session hijacking or unauthorized API access depending on how tokens are managed in this specific firmware version. The remote nature of the exploit means that any device connected to a public internet interface with port 80 or 443 open is potentially at risk. Attackers often use automated scanners to identify vulnerable IoT devices by probing for these known weaknesses, making timely remediation essential to prevent widespread compromise in home and small business networks where such routers are commonly deployed without adequate security hardening.
Mitigation strategies must focus on immediate patching and network-level controls. The primary defense is to update the router firmware to a version released after this vulnerability was disclosed by TOTOLINK, ensuring that the getLanguageCfg function has been patched with proper input validation and access control checks. If an updated firmware is not yet available or cannot be applied immediately, administrators should restrict administrative access through network segmentation, placing management interfaces on isolated VLANs inaccessible from untrusted networks like the internet. Additionally, disabling remote management features if they are not strictly necessary can significantly reduce the attack surface by preventing external actors from reaching the vulnerable endpoint altogether. Monitoring logs for unusual request patterns targeting language configuration endpoints may also help in detecting active exploitation attempts before significant damage occurs.