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CVE-2026-0265 is a pre-authentication authentication bypass vulnerability in Palo Alto Networks PAN-OS affecting PA-Series and VM-Series firewalls and Panorama appliances when Cloud Authentication Service (CAS) is enabled and attached to a login interface. The flaw is caused by improper verification of JSON Web Token signatures in the PAN-OS authentication path, including the pan_auth_verify function in libpanmp_mp.so. PAN-OS trusts the attacker-controlled JWT alg header and dispatches verification logic accordingly instead of enforcing the expected asymmetric signing algorithm for CAS-issued tokens. As described in public technical analysis, if the alg value is set to an HMAC variant such as HS256, the implementation uses CAS certificate material as the HMAC secret and accepts a forged token as valid. This algorithm-confusion condition allows an unauthenticated attacker with network access to craft a token that is treated as a legitimate CAS authentication artifact and thereby bypass authentication controls. The issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama, while Cloud NGFW and Prisma Access are not affected.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
59 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in Palo Alto Networks PAN-OS discussed as an example of a GitHub repository that only checked for the flaw rather than exploiting it.
A separate vulnerability affecting the Cloud Authentication Service scenario, mentioned only to distinguish it from CVE-2026-0257.
A specific PAN-OS vulnerability for which a Metasploit HTTP scanner module and documentation were added, indicating affected PAN-OS targets can be checked for vulnerable, patched, or not-affected status.
A PAN-OS authentication bypass vulnerability that can allow a remote unauthenticated party to bypass authentication when Cloud Authentication Service (CAS) is enabled, including bypass of GlobalProtect authentication and possible VPN access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.