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Cybersecurity researchers have discovered vulnerable code in legacy Python packages that could potentially pave the way for a supply chain compromise on the Python Package Index (PyPI) via a domain takeover attack.
Software supply chain security company ReversingLabs said it found the "vulnerability" in bootstrap files provided by a build and deployment automation tool named "zc.buildout."
"The scripts automate the process of downloading, building, and installing the required libraries and tools," security researcher Vladimir Pezo said. "Specifically, when the bootstrap script is executed, it fetches and executes an installation script for the package Distribute from python-distribute[.]org – a legacy domain that is now available for sale in the premium price range while being managed to drive ad revenue."
The PyPI packages that include a bootstrap script that accesses the domain in question include tornado, pypiserver, slapos.core, roman, xlutils, and testfixtures.a

> Legacy Python Bootstrap Scripts Create Domain-Takeover Risk in Multiple PyPI Packages

Cybersecurity researchers have shed light on a cross-tenant blind spot that allows attackers to bypass Microsoft Defender for Office 365 protections via the guest access feature in Teams.
"When users operate as guests in another tenant, their protections are determined entirely by that hosting environment, not by their home organization," Ontinue security researcher Rhys Downing said in a report.
"These advancements increase collaboration opportunities, but they also widen the responsibility for ensuring those external environments are trustworthy and properly secured."
The development comes as Microsoft has begun rolling out a new feature in Teams that allows users to chat with anyone via email, including those who don't use the enterprise communications platform, starting this month. The change is expected to be globally available by January 2026.

> MS Teams Guest Access Can Remove Defender Protection When Users Join External Tenants

Microsoft has announced plans to improve the security of Entra ID authentication by blocking unauthorized script injection attacks starting a year from now.
The update to its Content Security Policy (CSP) aims to enhance the Entra ID sign-in experience at "login.microsoftonline[.]com" by only letting scripts from trusted Microsoft domains run.
"This update strengthens security and adds an extra layer of protection by allowing only scripts from trusted Microsoft domains to run during authentication, blocking unauthorized or injected code from executing during the sign-in experience," the Windows maker said.
Specifically, it only allows script downloads from Microsoft trusted CDN domains and inline script execution from a Microsoft trusted source. The updated policy is limited to browser-based sign-in experiences for URLs beginning with login.microsoftonline.com. Microsoft Entra External ID will not be affected.
The change, which has been described as a proactive measure, is part of Microsoft's Secure Future Initiative (SFI) and is designed to safeguard users against cross-site scripting (XSS) attacks that make it possible to inject malicious code into websites. It's expected to be rolled out globally starting mid-to-late October 2026.

> Microsoft to Block Unauthorized Scripts in Entra ID Logins with 2026 CSP Update