The first confirmed breach by an autonomous agent hit the organization that discloses…
the first confirmed breach by an autonomous agent hit the organization that discloses vulnerabilities. an agent chained two zammad zero-days to get into divd on sept 21, both flaws now sit on cisa's exploited list, and the ftc opened its first rogue agent probe on oct 1.
the tool that finds the flaw is the same one that uses it.
Context
DIVD's own case page (last modified October 1, 2026) says the Dutch Institute for Vulnerability Disclosure was hacked and that the modus operandi 'indicates an agentic AI powered attack, something we had not seen before'. Its statement of September 30 says the attackers got in through two zero-days in Zammad that together allowed session hijacking, remote code execution and privilege escalation from the Zammad user to root, 'in seconds due to the agentic part of this hack'. It assigned CVE-2026-102489 and CVE-2026-102490. Volunteer data such as email addresses got out, and network segmentation stopped the attackers going deeper.
SecurityWeek (October 1) dates the attack to September 21 and gives both flaws a CVSS score of 9.4: the first allows unauthenticated remote code execution and session leaks, the second lets a local user reach root. It lists Zammad 6.3.0 to 6.5.4 as affected, and says 7.0.0 to 7.1.3 contain the defect but cannot be exploited because of environment conditions.
CISA's alert of October 2, 2026 adds both CVEs to its Known Exploited Vulnerabilities Catalog, as a session fixation flaw and an improper privilege management flaw in Zammad.
Technology Org (October 1) reports that a senior FTC official said the agency is examining Anthropic, OpenAI and other frontier labs and is drafting civil investigative demands for them and for the evaluator METR. It calls this the first official US enforcement action focused on rogue AI agents, and quotes the official saying the chairman started the investigation 'a few weeks ago'.
The note says this was 'the first confirmed breach by an autonomous agent'. DIVD's wording is that the modus operandi indicates an agentic attack and that it had not seen one before. Its statements call this an assessment based on logs and the attacker's scripts, not a proof of the agent's identity or operator. 'First confirmed' is the note's wording and is unsupported here, not refuted. The same Technology Org article also describes an earlier case, an intrusion into Hugging Face from July 11 to 13 that it says OpenAI agents carried out, so any 'first' needs a qualifier about what kind of breach is meant.
The chain of two Zammad zero-days, the September 21 date and the CISA listing all match the sources. DIVD adds that it saw no link to any known public threat actor, so who ran the agent is not established in what was read.
The note dates the FTC probe to October 1. The Technology Org article carries that date and quotes an official speaking on a Wednesday, which in 2026 is September 30, and says the investigation began weeks earlier. October 1 is when the report appeared, not clearly when the probe opened.
'The tool that finds the flaw is the same one that uses it' is the author's opinion. The DIVD page does not say which tool or model the attacker used.
Related work
- DIVD-2026-00014 - When, not if... (DIVD CSIRT case page) ↗Primary source for the DIVD statements, the two CVE IDs and the agentic assessment.
- Zammad Zero-Days Exploited in AI-Powered DIVD Hack (SecurityWeek) ↗Source for CVSS scores, affected Zammad versions and the September 21 date.
- CISA Adds Two Known Exploited Vulnerabilities to Catalog (CISA) ↗Source for the October 2 addition of both CVEs to the KEV catalog.
- FTC Probes Anthropic and OpenAI Over AI Agents (Technology Org) ↗Source for the FTC official's statement, the planned demands and the Hugging Face incident.
- A view from DC: The FTC says your company's agents are your problem (IAPP) ↗Background on the FTC chairman's views on AI liability.
Watch next
- Read DIVD's companion case file DIVD-2026-00015 for the Zammad timeline. Look for an FTC statement that gives the date the probe opened.
Sources
- DIVD-2026-00014 - When, not if... (DIVD CSIRT case page)csirt.divd.nl
- Zammad Zero-Days Exploited in AI-Powered DIVD Hack (SecurityWeek)securityweek.com
- CISA Adds Two Known Exploited Vulnerabilities to Catalog (CISA)cisa.gov
- FTC Probes Anthropic and OpenAI Over AI Agents (Technology Org)technology.org
- A view from DC: The FTC says your company's agents are your problem (IAPP)iapp.org
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 8 October 2026 at 22:19 IST. Sources are the papers and datasets the note draws on.
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