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Security News — 4 September 2026

A daily, automatically-compiled digest of the cyber security stories that broke in the last 24 hours, drawn from 11 trusted feeds. Each entry is a short excerpt — follow the link to read the full article at its original publisher. Compiled 4 September 2026 · 30 items.

Top 5 to watch today

  1. Critical Citrix NetScaler auth bypass now leveraged in attacks exploited BleepingComputer
  2. CISA Adds One Known Exploited Vulnerability to Catalog exploited CISA Current Activity
  3. CVE-2026-18658 — CRITICAL (CVSS 9.8) Critical CVEDatabase - Critical CVEs
  4. CVE-2026-85695 — CRITICAL (CVSS 9.3) Critical CVEDatabase - Critical CVEs
  5. CVE-2026-86095 — HIGH (CVSS 8.5) High CVEDatabase - Recent CVEs

Urgent Vulnerabilities 8

Actively exploited, critical, or high-severity flaws — patch or mitigate first.

BleepingComputer04 Sep

Critical Citrix NetScaler auth bypass now leveraged in attacks

KEV · exploited
Exploited
Yes — CISA KEV
Product
Citrix NetScaler
Impact
Authentication bypass
Audience
Network/firewall admins
Action
Patch per vendor / CISA KEV

Attackers have begun targeting a critical-severity Citrix NetScaler auth bypass flaw (CVE-2026-19490) in the wild, according to vulnerability intelligence company Previdian. [...]

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CISA Current Activity04 Sep

CISA Adds One Known Exploited Vulnerability to Catalog

KEV · exploited
Exploited
Yes — CISA KEV
Product
Google Chromium V8
Action
Patch per vendor / CISA KEV

CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-85046 Google Chromium V8 Type Confusion Vulnerability This type of vulnerability is a frequent a…

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CVEDatabase - Critical CVEs04 Sep

CVE-2026-18658 — CRITICAL (CVSS 9.8)

CriticalCVSS 9.8
Impact
SQL injection
Action
Patch when a fix is available; monitor exposure

CVSS 9.8 CRITICAL · Vendor: IBM IBM Operational Decision Manager 9.6.0.0, 9.5.0.0, 8.11.1.0, 8.11.0.1, 8.12.0.1, 9.5.0.1, and 9.0.0.1 is vulnerable to SQL injection. An unauthenticated attacker can execute arbitrary SQL statements and leve…

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CVEDatabase - Critical CVEs04 Sep

CVE-2026-85695 — CRITICAL (CVSS 9.3)

CriticalCVSS 9.3
Impact
Authentication bypass
Action
Patch when a fix is available; monitor exposure

CVSS 9.3 CRITICAL FastChat contains an authentication bypass vulnerability in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can…

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CVEDatabase - Recent CVEs04 Sep

CVE-2026-86095 — HIGH (CVSS 8.5)

HighCVSS 8.5
Impact
Out-of-bounds access
Audience
Network/firewall admins
Action
Patch when a fix is available; monitor exposure

CVSS 8.5 HIGH Unidata netcdf-c through 4.10.1 contains an out-of-bounds write vulnerability in NC4_HDF5_inq_attname() that copies HDF5 attribute names into a fixed 256-byte buffer without length validation. Attackers can craft HDF5 files w…

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CVEDatabase - Critical CVEs04 Sep

CVE-2026-85696 — CRITICAL (CVSS 9.3)

CriticalCVSS 9.3
Impact
Command injection
Action
Patch when a fix is available; monitor exposure

CVSS 9.3 CRITICAL SadTalker contains an OS command injection vulnerability in the video muxing process where uploaded audio filenames are interpolated into ffmpeg commands without proper escaping. Attackers can upload audio files with shel…

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CVEDatabase - Recent CVEs04 Sep

CVE-2026-86098 — HIGH (CVSS 8.3)

HighCVSS 8.3
Impact
Buffer overflow
Action
Patch when a fix is available; monitor exposure

CVSS 8.3 HIGH ntop nDPI versions before 6.0 contain a heap buffer overflow vulnerability in the ndpi_json_string_escape function that writes beyond caller-supplied buffer boundaries. Attackers can trigger the overflow by supplying crafted…

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CVEDatabase - Recent CVEs04 Sep

CVE-2026-86097 — HIGH (CVSS 7.1)

HighCVSS 7.1

CVSS 7.1 HIGH PX4 Autopilot through 1.17.0 contains a null pointer dereference vulnerability in param_set_default_file() and param_set_backup_file() functions that allows attackers to crash the autopilot process. Attackers can invoke 'para…

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Other CVEs 4

Lower-severity or unconfirmed-exploitation vulnerabilities.

CVEDatabase - Critical CVEs04 Sep

CVE-2026-47837 — MEDIUM (CVSS 6.8)

MediumCVSS 6.8
Impact
Missing authentication
Audience
Virtualization admins
Action
Patch when a fix is available; monitor exposure

CVSS 6.8 MEDIUM · Vendor: vmware Missing Authentication for Critical Function vulnerability in Spring Spring Cloud Config allows Webhook requests to Spring Cloud Config Server's /monitor endpoint are not validated. This issue affects Sprin…

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CVEDatabase - Recent CVEs04 Sep

CVE-2026-86096 — MEDIUM (CVSS 6.0)

MediumCVSS 6

CVSS 6.0 MEDIUM PX4 Autopilot through 1.17.0 contains a use-after-free vulnerability in TemperatureCalibration::start() due to a race condition between task spawning and object deletion. Attackers can trigger the calibration process via sh…

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Threat Activity 4

Malware, campaigns and adversary tradecraft.

Breaches & Incidents 3

Ransomware, data breaches and supply-chain events.

Research & Detection 4

Detection engineering, tooling and defensive analysis.

Policy & Commentary 7

Industry, executive and AI-security perspective.

Daniel Miessler04 Sep

Socratic AI

A charcoal sketch of a student straining in a squat under a loaded barbell while a purple AI figure spots him with both hands held just off the bar/images/socratic-ai.webp/images/socratic-ai.webp I've been thinking about what AI should loo…

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Daniel Miessler04 Sep

Cliff's Notes for Everything

A sienna sketch of a man squatting under a giant open book he is lifting overhead, while a purple robot arm on a desk hands a striped summary sheet to a faint gray figure/images/cliffs-notes-for-everything.webp/images/cliffs-notes-for-ever…

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Schneier on Security04 Sep

Using a VM to Contain an AI Agent

It won’t work : My suspicion was that GPT 5.6-Cyber would succeed, but the frequency and manner of its success removed all doubt. We have to reassess sandboxing quality for capable AI agents, and in general the software stack with which th…

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Schneier on Security04 Sep

Security Vulnerability in a Voting System

It’s a vulnerability that allows someone to recover the order of ballots cast, newly exploited with AI tools. Nearly four years since the original vulnerability was disclosed, I was still able to use it to analyze voter behavior in Georgia…

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Daniel Miessler04 Sep

Peak Human Readership

A lone writer in warm sienna works at a desk on top of a purple machine that crushes his pages into tiny slips for a crowd below staring at their phones, while one person in sienna stands apart reading a full page/images/peak-human-readers…

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