--- title: "Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257" url: https://daily.dev/posts/threat-brief-active-exploitation-of-pan-os-cve-2026-0257-dfp2l2o5k source_url: https://unit42.paloaltonetworks.com/active-exploitation-of-pan-os-cve-2026-0257 type: article source: "Unit 42" published: 2026-06-05T14:12:24.382Z updated: 2026-06-15T08:21:08.427Z tags: ["security", "vpn"] reading_time: 3 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257 **[Unit 42](https://daily.dev/sources/unit42)** · 3 min read · 0 upvotes · 0 comments ## Summary Palo Alto Networks Unit 42 is tracking active exploitation of CVE-2026-0257, an authentication bypass vulnerability in PAN-OS GlobalProtect portal and gateway components. An unidentified threat actor is using this flaw to circumvent security controls and initiate unauthorized VPN connections. The CVE was added to CISA's Known Exploited Vulnerabilities catalog on May 29. No post-access lateral movement has been confirmed yet. The report provides specific indicators of compromise including attacker IP addresses and suspicious host identifiers/MAC addresses to search for in GlobalProtect logs, along with post-PoC hardcoded client configuration values to monitor. Organizations are advised to hunt for these indicators, apply available mitigations or patches, and activate incident response protocols for any confirmed gateway-connected events. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Attackers exploit Palo Alto GlobalProtect flaw days after disclosure](https://daily.dev/posts/attackers-exploit-palo-alto-globalprotect-flaw-days-after-disclosure-7jl7oxcpm) · CSO Online · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#vpn](https://daily.dev/tags/vpn) [View this post on daily.dev](https://daily.dev/posts/threat-brief-active-exploitation-of-pan-os-cve-2026-0257-dfp2l2o5k)