CVE-2026-11535: PcSuite APP Auth Bypass Vulnerability

CVE-2026-11535 Overview

CVE-2026-11535 is an unauthorized access vulnerability in the Vivo PcSuite application. Attackers within adjacent network range can leverage this flaw to gain unauthorized access to a victim's device without authentication. The weakness is classified under [CWE-306] Missing Authentication for Critical Function. Vivo published details in their security advisory addressing the issue.

Critical Impact
An adjacent-network attacker can access a victim's device without credentials, compromising confidentiality and integrity of data handled by PcSuite and connected systems.

Affected Products

Vivo PcSuite Application
Devices paired with PcSuite over local network connections
Refer to the Vivo Security Advisory #22 for specific affected versions

Discovery Timeline

2026-06-12 - CVE-2026-11535 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-11535

Vulnerability Analysis

The vulnerability resides in the PcSuite application, which facilitates synchronization and management between mobile devices and companion software. PcSuite exposes functionality over an adjacent network channel without enforcing authentication on a critical function. An attacker on the same local network segment can interact with the exposed interface and reach protected device resources.

The weakness maps to [CWE-306] Missing Authentication for Critical Function. The flaw permits an unauthenticated peer to invoke operations that should require verified identity. According to the EPSS data from 2026-06-18, the probability of exploitation in the wild is currently low at 0.151%.

Root Cause

The root cause is the absence of an authentication check before granting access to sensitive PcSuite operations. The service trusts network reachability as an implicit access control. Any peer that can reach the listener can act as an authorized client.

Attack Vector

Exploitation requires adjacent network access, such as a shared Wi-Fi network or Bluetooth-bridged link. No user interaction and no prior privileges are needed. The attacker connects to the PcSuite listener and issues commands that retrieve or manipulate data on the victim device. No public proof-of-concept exploit is currently listed for this CVE.

Technical specifics are described in the Vivo Security Advisory #22.

Detection Methods for CVE-2026-11535

Indicators of Compromise

Unexpected PcSuite session establishments from unknown Wi-Fi peers or MAC addresses
Outbound or peer-to-peer connections to PcSuite service ports from devices not previously paired
Unexplained file enumeration, contact access, or media transfers initiated through PcSuite

Detection Strategies

Monitor mobile and host endpoints for PcSuite service activity originating from non-trusted local network peers
Inspect Wi-Fi access point logs for new client associations correlated with PcSuite traffic spikes
Alert on PcSuite-initiated data access operations occurring outside expected user-driven sessions

Monitoring Recommendations

Centralize network telemetry from corporate Wi-Fi and guest networks for retrospective hunting
Track behavioral baselines for PcSuite traffic volume and peer counts per device
Correlate mobile device logs with network identification events to surface adjacent-network probing

How to Mitigate CVE-2026-11535

Immediate Actions Required

Update Vivo PcSuite and associated device firmware to the latest version referenced in the vendor advisory
Restrict use of PcSuite to trusted private networks and avoid shared or public Wi-Fi while connected
Audit paired devices and remove any unknown or stale PcSuite associations

Patch Information

Vivo published remediation guidance in the Vivo Security Advisory #22. Apply the vendor-provided update for PcSuite and the affected device platform. Confirm the installed PcSuite version matches or exceeds the fixed release referenced by Vivo.

Workarounds

Disable PcSuite when not actively syncing devices to reduce exposure of the listener
Use isolated or segmented Wi-Fi networks for device-to-PC synchronization
Enforce host firewall rules that limit PcSuite communication to specific trusted peer addresses

bash

# Example: restrict PcSuite listener to a trusted host on Linux
sudo iptables -A INPUT -p tcp --dport <pcsuite_port> -s <trusted_ip> -j ACCEPT
sudo iptables -A INPUT -p tcp --dport <pcsuite_port> -j DROP