Indirect Prompt Injection and AI Agent Abuse Expands Real-World Attack Surface
Security researchers and industry reporting describe prompt injection—especially web-based indirect prompt injection (IDPI)—as an increasingly practical technique for compromising or manipulating LLM-powered agents embedded in browsers and automated content pipelines. Palo Alto Networks Unit 42 reported in-the-wild IDPI activity where malicious instructions are hidden in web content that an agent later ingests, with observed objectives including AI-based ad review evasion and SEO manipulation that promotes phishing infrastructure. Separately, Zenity Labs detailed a now-patched issue in Perplexity’s Comet AI browser where attackers could embed instructions in a calendar invite to coerce the agent into accessing file:// resources and potentially pivoting into sensitive data such as an unlocked 1Password extension vault, illustrating how agentic tooling can bypass traditional browser-origin assumptions.
Threat reporting also shows adversaries operationalizing AI to scale exploitation. Team Cymru linked an AI-assisted Fortinet FortiGate targeting campaign (previously reported by Amazon Threat Intelligence as compromising 600+ devices across 55 countries using services like Claude and DeepSeek) to use of CyberStrikeAI, an open-source Go-based platform that integrates 100+ security tools and was observed from multiple IPs (primarily hosted in China/Singapore/Hong Kong, with additional infrastructure elsewhere). Multiple commentaries and briefings emphasize that conventional “filter the prompt” defenses are insufficient because LLMs lack a native separation between instructions and data; they call for defense-in-depth around AI pipelines, including least-privilege agent permissions, auditable tool use, and stronger identity/workload controls as agent deployments multiply. Several items in the set are unrelated (geopolitical cyber activity, workforce/culture pieces, jobs, and product/market commentary) and do not materially inform the prompt-injection/agent-abuse story.
Timeline
Mar 3, 2026
Team Cymru links CyberStrikeAI to global AI-driven FortiGate attacks
On March 3, 2026, Team Cymru reported that an AI-assisted campaign targeting Fortinet FortiGate appliances used the open-source CyberStrikeAI offensive platform. The activity was associated with automated mass scanning from 212.11.64[.]250 and attributed in reporting to a suspected Russian-speaking threat actor, while the tool's developer showed possible ties to Chinese state-linked entities.
Mar 3, 2026
Zenity publicly discloses Comet browser calendar invite exploit chain
On March 3, 2026, reporting detailed Zenity Labs' findings that Perplexity's Comet AI browser could be exploited through calendar invitations to access local files and potentially abuse an unlocked 1Password session. The disclosure also noted Perplexity's prior fixes and framed calendar entries as an underappreciated attack surface for AI agents.
Mar 3, 2026
Unit 42 reports indirect prompt injection is now observed in the wild
On March 3, 2026, Palo Alto Networks Unit 42 published research stating that web-based indirect prompt injection had moved from proof-of-concept to active real-world weaponization. The report documented additional detections involving SEO poisoning, unauthorized payment attempts, data exfiltration, and destructive commands, and recommended defense-in-depth mitigations.
Mar 3, 2026
AIUC-1 Consortium issues 2025 briefing on enterprise AI agent risks
A 2025 briefing cited on March 3, 2026 by the AIUC-1 Consortium, with input from Stanford's Trustworthy AI Research Lab and more than 40 security executives, identified autonomous overprivileged agents, shadow AI visibility gaps, and prompt injection trust failures as the dominant enterprise AI risk areas. It recommended technical controls such as tool-call validation, prompt-injection logging, containment testing, and continuous adversarial testing.
Mar 2, 2026
Samsung SDS publishes top enterprise cyber threats for 2026
On March 2, 2026, Samsung SDS published an assessment naming AI-based threats, ransomware, cloud security issues, phishing/account takeovers, and data security as the five most significant enterprise cybersecurity risks for 2026. The report recommended mitigations including least privilege for AI agents, hardened backups, CNAPP adoption, MFA, and stronger data access controls.
Feb 26, 2026
Amazon discloses AI-assisted compromise of 600+ FortiGate devices
Before March 2026, Amazon Threat Intelligence disclosed that an attacker used generative AI services including Anthropic Claude and DeepSeek to compromise more than 600 FortiGate devices across 55 countries. This disclosure established the scale of the FortiGate campaign later tied to CyberStrikeAI activity.
Feb 1, 2026
Perplexity issues second patch that closes Comet exploit vector
In February 2026, Perplexity released a subsequent patch that reportedly closed the specific Comet browser exploit path involving file:// access and calendar-invite-delivered indirect prompt injection.
Jan 25, 2026
1Password publishes advisory and adds hardening options
In late January 2026, 1Password issued an advisory related to the Comet browser research and introduced hardening options. The company noted the risk stemmed from an AI agent operating inside an already authenticated session rather than a flaw in 1Password's external security model.
Jan 20, 2026
CyberStrikeAI infrastructure observed in FortiGate attack activity
Between January 20 and February 26, 2026, Team Cymru observed 21 unique IP addresses running the open-source CyberStrikeAI platform, with infrastructure concentrated in China, Singapore, and Hong Kong. The tooling was linked to AI-assisted activity targeting Fortinet FortiGate devices.
Jan 1, 2026
Perplexity ships initial Comet fix for calendar invite attack path
In January 2026, Perplexity released an initial fix for the Comet browser issue involving indirect prompt injection via calendar invites. Zenity later found a way to bypass this first remediation.
Dec 1, 2025
Unit 42 detects indirect prompt injection against ad review system
In December 2025, Palo Alto Networks Unit 42 observed a real-world web-based indirect prompt injection attempt targeting an AI-driven advertisement review system. The attack used concealed prompt-delivery techniques on a scam advertorial page to try to bypass the review process.
Dec 1, 2025
NCSC warns prompt injection may be unsolved at the input level
In December 2025, the UK National Cyber Security Centre warned that prompt injection in LLMs may be an unsolved or even unsolvable problem at the input layer because models do not inherently separate instructions from data.
Nov 1, 2025
BlackBoxAI extension research uncovers prompt leakage and code execution risks
In November 2025, ERNW researcher Ahmad Abolhadid analyzed the BlackBoxAI Visual Studio Code extension and showed it could be manipulated to reveal system prompts and execute attacker-supplied code through indirect prompt injection. The demonstrations included reverse-shell compromise and repeated attempts to coerce privileged execution.
Oct 1, 2025
Perplexity notified of Comet calendar invite prompt-injection flaw
In October 2025, Zenity Labs reported to Perplexity that its Comet AI browser could be manipulated through indirect prompt injection delivered via calendar invitations, enabling access to local files and other sensitive resources under certain conditions.
Jan 1, 2023
OWASP ranks prompt injection as top LLM application risk
OWASP has listed prompt injection as the top vulnerability in its LLM Applications Top 10 since 2023, establishing it as a leading security concern for AI-enabled systems.
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