Tuesday’s brief: PHP2Shell attacks now work, then GitHub secret dumps, a Linux root exploit and .NET Brotli fixes

By George Bailey   Published: 10/27/26   2 min read

Good morning. PHP2Shell is now confirmed exploited: honeypots recorded working shells over the weekend, and CISA added both flaws to its exploited list on Monday with a Thursday deadline. Stolen GitHub tokens are dumping secrets from private repositories, a public Linux exploit gets root on current Ubuntu and Debian, and Microsoft shipped emergency .NET fixes for the Brotli bug we covered yesterday.

Lead Story

PHP2Shell attacks now produce working shells, and CISA has listed both flaws as exploited with an October 29 deadline. Patch and check by Thursday →

Also Worth Your Attention

Gheist uses stolen GitHub tokens to plant ci-sync branches that print repository secrets into Actions logs. Search your branches →

A public Linux exploit gets root on Ubuntu, Debian and AlmaLinux before most distros have a fixed kernel. Close the namespace path →

Microsoft shipped out-of-band .NET and PowerShell fixes for the Brotli bug, and PHP rebuilt its Windows packages. Rebuild what bundles it →

Also on the radar: Palo Alto’s last PAN-OS hotfixes for the PHP flaws are due October 27 to 30, so keep management interfaces on trusted addresses until yours lands (Palo Alto advisory). Huntress tied a Microsoft 365 token-replay campaign to 97 hijacked accounts at 79 organizations and 48 rogue Entra devices, with failed logins from 193.26.115.0/24 (The Hacker News). Sansec found 953 online stores, mostly Magento, loading hidden JavaScript through CMS blocks (The Hacker News).

Checking servers for planted shells this week? Our CySA+ exam guide covers the log and process triage behind it.

Source: CISA KEV addition; Wiz on Gheist; AlmaLinux kernel notice; .NET out-of-band updates

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George Bailey

George Bailey is the byline of the CyberExperts editorial desk, the team behind the CyberExperts Daily Brief. The desk covers vulnerabilities, breaches and security news from vendor advisories, CISA alerts and other primary sources, and links those sources in every story. Questions or corrections: [email protected].