CVE-2026-21035: Samsung Plus TV Information Disclosure – Exploit Details & Patch Guide

Technical summary

CVE-2026-21035 is an improper input validation vulnerability in Samsung Plus TV. The weakness allows remote, unauthenticated attackers to extract sensitive information through the network. The CVSS v3.1 score of 7.5 (HIGH) reflects a vector with no access complexity (AC:L), no privilege requirement (PR:N), and no user interaction (UI:N), indicating the flaw is readily exploitable in default or typical configurations. The impact is limited to confidentiality; integrity and availability are not affected.

Business impact

If your organization uses Samsung Plus TV devices—whether in conference rooms, digital signage, or media environments—this vulnerability could allow attackers to harvest sensitive data without detection. The lack of authentication requirements makes this a concern for any deployment accessible from untrusted networks. Data exposure could range from device configuration details to user credentials or content metadata, depending on what information the TV stores or processes. Unpatched devices in networked environments represent an ongoing information disclosure risk.

Affected systems

All Samsung Plus TV models running firmware versions prior to 1.0.28.6 are affected. The vulnerability is triggered remotely over the network and does not require physical access or special privileges, making it applicable to any unpatched instance regardless of deployment context.

Exploitability

This vulnerability is classified as highly exploitable. The attack vector is network-based (AV:N), requires no special access complexity (AC:L), demands no authentication (PR:N), and needs no user interaction (UI:N). Exploitation is straightforward: an attacker can craft malformed input requests and trigger information disclosure. The lack of active exploitation evidence in the KEV catalog does not diminish technical exploitability—it reflects current threat intelligence rather than a security gap.

Remediation

Update Samsung Plus TV firmware to version 1.0.28.6 or later. This patch addresses the input validation flaw and restores proper request handling. For organizations unable to patch immediately, restrict network access to TV devices using firewall rules, network segmentation, and access control lists. Disable remote management features if not required, and monitor for unusual traffic patterns directed at these devices.

Patch guidance

Samsung has released firmware version 1.0.28.6 and later to resolve this issue. Verify the current firmware version on each Samsung Plus TV device (typically found in Settings > About or System Information). Download the latest firmware from Samsung's support portal and follow their update procedure, which may involve USB installation or over-the-air update depending on the device model. After patching, confirm the new version is active. Stagger updates during maintenance windows to avoid disruption if devices are actively used. Test in a non-critical environment first if possible.

Detection guidance

Monitor network traffic for unusual requests to Samsung Plus TV devices, particularly POST or PUT requests with malformed payloads. Watch for anomalous patterns such as repeated connection attempts from external IPs, high-volume data exfiltration, or repeated HTTP errors from TV devices. Query device logs for authentication bypass attempts or unauthorized configuration changes. Endpoint detection tools may flag suspicious process activity if an attacker gains command execution post-exploitation. Compare firmware versions across your TV inventory to identify any devices still running versions before 1.0.28.6. Use SNMP or DHCP logs to track device communications.

Why prioritize this

This vulnerability merits rapid prioritization due to its HIGH severity rating, network accessibility, and lack of authentication requirements. The combination of remote exploitability and information disclosure makes it a natural target for reconnaissance attacks. While not yet tracked as actively exploited in the wild, organizations should assume that once patch timelines are widely known, threat actors will attempt to identify and compromise unpatched devices. Internet-facing or untrusted-network-adjacent deployments should be patched first.

Risk score, explained

The CVSS v3.1 score of 7.5 reflects the impact of unauthenticated, network-based information disclosure. High exploitability (AV:N, AC:L, PR:N, UI:N) combined with confidentiality impact (C:H) and no complexity in attack execution justify the HIGH rating. The absence of integrity or availability impact prevents a Critical score. For organizations where Samsung Plus TVs store or process sensitive business data, the practical risk may be elevated depending on deployment context.

Frequently asked questions