Threat Brief: Mitigating Large-Scale Credential Attacks

Unit 42 published a multi-article threat roundup (June 2026) covering high-risk active exploitation and attacker techniques across cloud, endpoint, and supply-chain vectors. Key items include active exploitation of PAN-OS CVE-2026-0257 (with IOCs and mitigations), a Vertex AI Python SDK model-upload vulnerability enabling cross-tenant RCE via bucket-squatting/pickle deserialization, large-scale credential-attack guidance, cloud logging manipulation techniques, and macOS threats (new Tahoe 26 artifact and the FlutterShell backdoor delivered via malvertising). Additional coverage addresses AI‑/s