A week in security (January 19 – January 25)

Last week on Malwarebytes Labs: Spammers abuse Zendesk to flood inboxes with legitimate-looking emails, but why? Fake LastPass maintenance emails target users Under Armour ransomware breach: data of 72 million customers appears on the dark web Can you use too many LOLBins to drop some RATs?...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment

Summary A vulnerability in Fleet’s Windows MDM enrollment flow could allow an attacker to submit forged authentication tokens that are not properly validated. Because JWT signatures were not verified, Fleet could accept attacker-controlled identity claims, enabling enrollment of unauthorized...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JWT verification process. An attacker can gain unauthorized enrollment of rogue devices by submitting a forged JWT with arbitrary identity claims, as the system fails to verify th...

GHSA-63M5-974W-448V Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment

Summary A vulnerability in Fleet’s Windows MDM enrollment flow could allow an attacker to submit forged authentication tokens that are not properly validated. Because JWT signatures were not verified, Fleet could accept attacker-controlled identity claims, enabling enrollment of unauthorized...

PT-2026-3741

Impact If Windows MDM is enabled, an attacker can enroll rogue devices by submitting a forged JWT containing arbitrary identity claims. Due to missing JWT signature verification, Fleet accepts these claims without validating that the token was issued by Azure AD, allowing enrollment under any Azu...

CVE-2020-12106

The Web portal of the WiFi module of VPNCrypt M10 2.6.5 allows unauthenticated users to send HTTP POST request to several critical Administrative functions such as, changing credentials of the Administrator account or connect the product to a rogue access point...

CVE-2023-43551

Cryptographic issue while performing attach with a LTE network, a rogue base station can skip the authentication phase and immediately send the Security Mode Command...

CVE-2025-20794

In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patc...

CVE-2025-20761

In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch...

CVE-2025-20762

In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch...

CVE-2025-20760

In Modem, there is a possible read of uninitialized heap data due to an uncaught exception. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for...

CVE-2019-12587

The EAP peer implementation in Espressif ESP-IDF 2.0.0 through 4.0.0 and ESP8266NONOSSDK 2.2.0 through 3.1.0 allows the installation of a zero Pairwise Master Key PMK after the completion of any EAP authentication method, which allows attackers in radio range to replay, decrypt, or spoof frames v...

VS Code Forks Recommend Missing Extensions, Creating Supply Chain Risk in Open VSX

Popular artificial intelligence AI-powered Microsoft Visual Studio Code VS Code forks such as Cursor, Windsurf, Google Antigravity, and Trae have been found to recommend extensions that are non-existent in the Open VSX registry, potentially opening the door to supply chain risks when bad actors...

CVE-2025-20793

In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch...

CVE-2025-20794

In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patc...