U.S. Agencies Warn of AI-Assisted Attacks on Siemens S7 PLCs

🕵️ RESEARCH & DEEP DIVES

• U.S. Agencies Warn of AI-Assisted Attacks on Siemens S7 PLCs
  Federal agencies warn of an active AI-assisted campaign targeting Siemens S7 PLCs.

  • The activity targets U.S. critical manufacturing, energy, water, chemical, food and agriculture, and commercial facilities.
  • Siemens S7-200, S7-300, S7-400, S7-1200, and S7-1500 PLCs are targeted, including S7-1500 F-series safety controllers.
  • Threat actors use Censys and ZoomEye to find internet-exposed PLCs running outdated software or using weak authentication.
  • AI-generated Python scripts incorporating snap7.dll or python-snap7 mimic legitimate monitoring tools and provide read/write access through S7comm.
  • The actors can read or modify PLC memory, configuration data, data blocks, and ladder logic programs.
    📄 Source: media.defense.gov · 📎 Coverage: cyberscoop.com · 👁 via SecurityWeek

• Claude Opus uncovers SAML authentication bypasses across four projects
  Oblique Security used Claude Opus to uncover SAML authentication bypasses.

  • Affected projects included Authentik, litesaml/lightsaml, OneUptime, and Java saml-client.
  • Authentik’s CVE-2026-57580 enabled account takeover under non-default USERNAME_LINK or EMAIL_LINK matching; fixed in 2026.2.6 and 2026.5.5.
  • Signature-wrapping flaws caused applications to trust unsigned identity data despite valid XML signatures.
  • Signature-validation bypasses in authentication requests, attribute queries, and logout requests enabled information disclosure or arbitrary logouts.
  • Unauthenticated XML processing also exposed multiple libraries to excessive-memory denial-of-service conditions.
    📄 Source: oblique.security · 📎 Coverage: cybersecuritynews.com · 👁 via Cyber Security News

📋 CVEs & KEV

• CVE-2026-49420 — CVSS 8.8 — Buffer overflow in libalias RTSP handlerThe RTSP handler in libalias rewrote ...

• CVE-2026-49422 — CVSS 8.4 — Use-after-free in TCP RACK stack option handlerThe RACK setsockopt(2) handler...

• CVE-2026-49429 — CVSS 7.8 — Kernel heap overflow in ZFS_IOC_USERSPACE_MANY ioctlThe ZFS_IOC_USERSPACE_MAN...

• CVE-2026-19582 — CVSS 7.8 — Binutils: stack buffer overflow in gnu binutils in rsrc_print_name from an un...

• CVE-2026-75963 — CVSS 7.5 — Events Made Easy through 3.2.5 - Authenticated (Contributor+) Local File Inclusion...

• CVE-2026-76956 — CVSS 7.5 — In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's r...

📋 ADVISORIES

• 📄 Source for Zimbra CVE-2026-73570 RCE Exploited in the Wild — cyber.gc.ca