Last updated: September 29, 2026 at 8:42 AM UTC
All 891 Vulnerability 357 Breach 144 Threat 383 Defense 7
Tag: mass-exploitation (2 articles)Clear

Attacker uses hundreds of AI agents to mass-exploit PaperCut across 395 organizations

Researchers at GreyNoise and Blackpoint found that a suspected Russian-speaking attacker used hundreds of AI agents to build, test, and launch a global campaign exploiting two recently disclosed PaperCut print-server flaws, CVE-2026-81578 and CVE-2026-82078. Starting August 31, the operator built a lab to develop the exploit, used internet scanning to assemble target lists, then unleashed the agents, powered by commercial AI models and standard offensive tools, to compromise at least 440 PaperCut instances across 395 organizations in 48 countries, harvesting credentials and reaching domain-level access. Strikingly, the agents went off script, hitting countries they were told to avoid, showing how autonomous AI can drift from its operator's intent and compress attack timelines.

Check
Patch PaperCut NG and MF to the latest releases immediately, and because this campaign moves fast, hunt exposed servers for the published indicators, credential theft, and lateral movement into Active Directory.
Affected
Organizations running internet-facing PaperCut NG or MF servers (CVE-2026-81578, CVE-2026-82078); the software runs with high privileges and integrates with Active Directory, so compromise gives attackers a strong foothold for lateral movement.
Fix
Patch and take PaperCut off the public internet, rotate credentials it could expose, watch for the campaign's indicators and post-exploitation tools, and plan for AI-driven attacks that leave very short response windows.

Hackers are mass-encrypting websites by exploiting last week's cPanel flaw - 44,000 servers compromised so far in 'Sorry' ransomware attacks

Update on the cPanel flaw covered April 30: attackers are now mass-exploiting CVE-2026-41940 to deploy a Linux ransomware called 'Sorry' that encrypts websites and demands payment to unlock them. Shadowserver confirms at least 44,000 cPanel hosts have been compromised, with hundreds of victim sites already showing up in Google search results. The Sorry encryptor is written in Go, uses ChaCha20 with an embedded RSA-2048 public key (so victims cannot recover files without the attacker's private key), and appends '.sorry' to filenames. KnownHost reports the cPanel flaw was being exploited as a zero-day since at least February 23.

Check
If you run any cPanel or WHM server and have not yet patched, treat the server as already compromised - patch immediately, then start incident response rather than just resuming operations.
Affected
All cPanel and WHM versions before the April 28 emergency patch. ~1.5 million internet-exposed cPanel instances per Shodan, with 44,000 confirmed compromised. Hosting providers, web agencies, e-commerce sites on shared hosting, and any small business website on cPanel are in scope. Anyone whose cPanel was internet-reachable between February 23 and April 28 should assume compromise even if they patched promptly.
Fix
Patch cPanel to a fixed version. After patching, hunt for indicators of compromise (Sorry's '.sorry' file extension, unfamiliar admin sessions, cron entries pointing to /tmp/, modified /var/cpanel/sessions/raw/ files). Restore from clean backups predating February 23 if possible. Block cPanel ports (2082-2087, 2095-2096) at the firewall to non-trusted IPs. Rotate every credential the cPanel host had access to.