Signal Execs Warn of Agentic AI Risks: Security and Privacy Threats

Signal executives Meredith Whittaker and Joshua Lund warn that agentic AI, with its autonomous capabilities and deep system integration, poses severe risks including security vulnerabilities, unreliability in multi-step tasks, and massive privacy erosion through surveillance. They urge the industry to implement opt-out defaults, transparency, and rigorous testing before widespread deployment.
Signal Execs Warn of Agentic AI Risks: Security and Privacy Threats
Written by Ava Callegari

The Hidden Dangers Lurking in AI’s Autonomous Ambitions

In the rapidly evolving world of artificial intelligence, a new breed of technology known as agentic AI is capturing the imagination of developers and consumers alike. These systems, designed to act independently on behalf of users—booking flights, managing emails, or even negotiating deals—promise a future of seamless automation. But recent warnings from top executives at Signal, the encrypted messaging app renowned for its privacy focus, paint a starkly different picture. Signal President Meredith Whittaker and Vice President of Engineering Joshua Lund have issued a clarion call, highlighting profound risks that could undermine security, reliability, and personal privacy on a massive scale.

Their concerns stem from the fundamental architecture of agentic AI, which often requires deep integration into operating systems and access to vast troves of personal data. Whittaker, speaking in a recent interview, described these agents as potentially creating “databases storing entire digital lives” that become prime targets for malware and unauthorized access. This isn’t mere speculation; it’s rooted in the way these AI systems are being deployed, often without explicit user consent, embedding themselves at the core of devices and platforms.

Lund echoed these sentiments, emphasizing the unreliability of multi-step tasks performed by these agents. Each action in a chain can introduce errors, leading to cascading failures that not only frustrate users but also open doors to exploitation. As AI companies race to integrate these capabilities into everyday tools, the Signal leaders argue that the industry must pause and reassess before irreversible damage occurs.

Unpacking the Security Vulnerabilities

The core issue, as outlined by Whittaker and Lund in their discussion with Coywolf News, revolves around the unprecedented level of access these agents demand. Unlike traditional apps that operate in silos, agentic AI seeks “root” privileges, blurring the lines between applications and the underlying operating system. This integration, while enabling powerful functionalities, exposes users to novel threats. Malware could exploit these pathways to siphon off sensitive information, from financial records to private communications, all stored in centralized databases that Whittaker warns are “accessible to malware.”

Recent incidents underscore this vulnerability. In the fourth quarter of 2025, reports of AI agent attacks surfaced, expanding the attack surface for cybercriminals, as detailed in an analysis by eSecurity Planet. These events involved agents being manipulated to perform unauthorized actions, highlighting how autonomy can backfire. Whittaker has been vocal about this for months, previously stating at the SXSW conference that agentic AI poses “profound” security and privacy issues, according to coverage in TechCrunch.

Moreover, the reliability factor cannot be overstated. Lund points out that while simple tasks might succeed, complex sequences often falter, with error rates compounding at each step. This isn’t just an inconvenience; in critical applications like healthcare or finance, such unreliability could lead to real-world harm. The Signal executives urge a slowdown in deployment, advocating for rigorous testing and mitigation strategies before these systems become ubiquitous.

Privacy Erosion and Surveillance Risks

Beyond security, the surveillance implications are equally alarming. Agentic AI, by design, aggregates and analyzes vast amounts of personal data to function effectively. Whittaker describes this as a “surveillance nightmare,” where users’ entire digital existences are compiled into profiles that could be harvested by governments, corporations, or hackers. In a Fortune interview last November, she labeled AI agents an “existential threat” to secure messaging apps, warning that consumers and businesses are woefully unprepared, as reported in Fortune.

This concern aligns with broader industry sentiments. Posts on X (formerly Twitter) from tech influencers and cybersecurity experts reflect growing unease, with many echoing Whittaker’s fears about AI agents gaining excessive access to personal information. For instance, discussions highlight how these systems could inadvertently enable mass surveillance, especially when integrated into operating systems without opt-out options. Whittaker has consistently argued that without transparency and user control, these agents erode the foundations of privacy that apps like Signal strive to protect.

The Times of India captured this urgency in a December 2025 article, noting Whittaker’s warnings about massive security holes created by OS-level AI integration, as seen in The Times of India. She stresses that opting users in by default exacerbates the problem, turning personal devices into potential surveillance tools. This isn’t hypothetical; regulatory bodies are taking note, with the National Institute of Standards and Technology (NIST) recently soliciting insights on agentic AI risks through a request for information, as covered by ExecutiveGov.

Industry Responses and Calls for Action

The tech sector’s push toward agentic AI has been relentless, driven by hype and investment. Yet, Signal’s leadership is not alone in their critique. A Reddit thread on r/AskNetsec debated whether Whittaker’s warnings represent genuine threats or fear-mongering, with users pointing to emerging attack vectors, as documented in Reddit. Experts there argue that while AI itself isn’t inherently malicious, its implementation often lacks robust safeguards, amplifying existing internet security flaws.

In response, Whittaker and Lund propose concrete steps for mitigation. They advocate making opt-out the default, requiring explicit developer opt-ins, and demanding radical transparency from AI companies. This includes auditable details on how agents operate, ensuring users understand and control data flows. Without such measures, they warn, consumer trust in AI could evaporate, jeopardizing the technology’s future. Computer Weekly highlighted this in a July 2025 piece, where Whittaker emphasized that “secure by design” principles are absent in agentic AI, per Computer Weekly.

Further, NIST’s Center for AI Standards and Innovation is actively seeking best practices, as reported by FedScoop, indicating a growing recognition of these issues at the governmental level. This aligns with Whittaker’s call for the industry to “pull back” until threats are addressed, preventing a scenario where agentic AI becomes synonymous with insecurity.

Broader Implications for Technology and Society

The warnings from Signal extend beyond technical flaws to societal impacts. As AI agents become more autonomous, they redefine trust in digital systems. Whittaker has pointed out that these agents threaten to “break the blood-brain barrier” between app and OS layers, a metaphor that resonates in tech circles, as shared in X posts by figures like vitrupo. This barrier, once breached, could normalize pervasive monitoring, echoing historical battles over encryption and privacy.

In critical sectors, the stakes are even higher. Disruptions from unreliable or compromised agents could affect healthcare systems or transportation networks, though Signal’s focus remains on personal privacy. SecurityWeek’s recent article on rethinking security for agentic AI notes that the independent nature of these systems introduces both opportunities and unprecedented risks, detailed in SecurityWeek.

Moreover, identity management emerges as a battleground, with AI eroding traditional trust signals, as explored in a SC Media feature on 2026 trends, found at SC Media. Whittaker’s advocacy for privacy-preserving AI design is crucial here, urging developers to prioritize user control over convenience.

Pathways to Safer AI Development

To navigate these challenges, industry insiders suggest a multifaceted approach. First, enhancing cryptographic protections could shield data even within agentic systems, though Whittaker admits current solutions are more triage than cure. Collaborative efforts, like those NIST is fostering, could standardize security protocols, ensuring agents operate without excessive privileges.

Education plays a role too. By informing users about risks, companies can foster informed consent, countering the default opt-in model. X discussions reveal a mix of skepticism and support for Whittaker’s stance, with some users calling for open-source alternatives to proprietary AI agents, potentially reducing surveillance risks.

Finally, regulatory oversight might be inevitable. As threats mount, governments could mandate audits and transparency, building on precedents like Europe’s data protection laws. Signal’s willingness to challenge surveillance mandates, as Whittaker has stated in various forums, sets a precedent for ethical tech development.

Voices from the Frontlines

Interviews and panels featuring Whittaker reveal a consistent theme: the hype surrounding agentic AI often overshadows its downsides. In her Fortune discussion, she stressed unpreparedness, a point reinforced by real-world attacks in late 2025. Lund complements this by focusing on engineering realities, where reliability breakdowns could deter adoption.

Comparisons to past tech rollouts, like the internet’s early security lapses, abound. Just as those were addressed through protocols like HTTPS, agentic AI needs similar innovations. Posts on X from cybersecurity accounts, such as The Hacker News, highlight parallels with encryption debates, underscoring the need for vigilance.

Ultimately, Signal’s warnings serve as a wake-up call. By heeding them, the industry can steer agentic AI toward a future that’s innovative yet secure, preserving the privacy that underpins digital freedom. As Whittaker puts it, without change, we risk an era where autonomy comes at the cost of control.

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