Perimeter Brief — 5 stories. Every morning. No noise.

Cybersecurity digest

SIGNAL,
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5 curated stories every morning. Threats, patches, and breaches filtered from 12+ sources — with a straight take on what you need to do about them. No vendor fluff. No recycled press releases.

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Today's Issue

// SAMPLE — UPDATED DAILY
// Editor's take

Three breach disclosures this week share one uncomfortable root cause: MFA bypass via session token theft. Attackers stopped caring about the login screen two years ago. If your org treats "MFA enabled" as a checkbox rather than a starting point, today's stories are a preview of your next incident report. Watch how CrowdStrike's detection guidance evolves on this — they're usually 60 days ahead of everyone else.

CISA KEV
CISA Adds Cisco SD-WAN Auth Bypass to Known Exploited Catalog
CVE-2026-20133 added after confirmed in-the-wild exploitation. Federal agencies have until May 6 to patch. Enterprise exposure is wide — SD-WAN Manager is broadly deployed in mid-market and up.
Action requiredPatch Cisco SD-WAN Manager immediately per cisco-sa-sdwan-authbp. Discontinue use if patch unavailable before deadline.
The Record
BlackCat Insider Negotiator Pleads Guilty to Federal Ransomware Charges
A Florida man admitted acting as a ransomware negotiator for BlackCat/ALPHV while posing as a legitimate IR consultant. First conviction of an "insider negotiator" — a gap most IR playbooks haven't accounted for.
SecurityWeek
CrowdStrike Patches Critical LogScale Flaw; Tenable Fixes High-Severity Nessus Bug
Two of the most privileged tools in enterprise security issued patches the same week. Both have read access to production environments. Accelerate your patch cycle on these specifically.
Action requiredPatch CrowdStrike LogScale and Tenable Nessus this week. These tools sit inside your perimeter with elevated credentials.
01
Curated, not aggregated
We monitor 12+ sources and surface only the 5 stories that change what you should do today. An editor makes the call — not a keyword filter.
02
Actionable by default
Every story that needs a response gets a clear action line. Stories without one don't get a fake one padded in. No filler.
03
KEV-aware daily
CISA's Known Exploited Vulnerabilities catalog is checked every morning. If something was exploited in the wild yesterday, it's in your inbox by 6am.
04
Zero vendor content
No sponsored stories. No affiliate links. No "partner content." Subscriber revenue is the only business model — so we work for you.

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