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Company

VulnCheck

Vulnerability intelligence company that tracks exploited CVEs, scanning activity, and initial-access threats, and acts as a CVE Numbering Authority.

Known aliases

  • VulnCheck CNA
  • vulncheck.com
  • VulnCheck Inc.
  • VulnCheck Initial Access Intelligence
  • VulnCheck Target Intelligence
  • VulnCheck zero-day research team

Current stories

securityOne report1 publisher

Chrome CVE disclosures rose 563% by May in a surge VulnCheck partly credits to AI bug hunting

VulnCheck counted Chrome CVEs up 563% and GitHub-issued CVEs up 476% year to date in a May 14, 2026 post. It calls the rise consistent with AI-assisted bug finding, but whether the volume lasts is unknown, so exploitation data still sets patch order.

Publishers:vulncheck.com

Reality

Evidence55
Adoption
Not scored
Hype gap+15
Incentives
Not scored
Confidence50
buildOne report1 publisher

A path-handling bug in one Atlassian library exposes eight products to unauthenticated file reads

Atlassian rates CVE-2026-21589 critical at CVSS 4.0 9.3, a no-login file-read flaw in every version of eight self-hosted products. Honeypots saw exploitation attempts by October 6, a day after the advisory, according to a dev.to write-up that found no public report of confirmed victims.

Publishers:dev.to

Reality

Evidence62
Adoption
Not scored
Hype gap−10
Incentives
Not scored
Confidence60
buildOne report1 publisher

DeepSeek Harness lets a sandboxed agent escalate itself to full access via an unauthenticated API

DeepSeek Harness, DeepSeek's open-source agent runner, carries a 9.4-severity flaw that lets a sandboxed agent grant itself full access with one command. Its control API has no authentication and trusts a client-supplied Host header.

Publishers:dev.to

Reality

Evidence45
Adoption55
Hype gap+20
Incentives
Not scored
Confidence40
securityConfirmed15 publishers

Atlassian tells Data Center customers to pull exposed servers offline over a 9.3 file-read flaw

Atlassian disclosed a 9.3-rated flaw, CVE-2026-21589, that lets attackers with no login read known files in 8 self-hosted Data Center products. It wants internet-facing instances taken offline or cut off from outside access until they are upgraded or behind a blocking rule.

Perspective Coverage

15 publishers
Builder
Builder 24%
Operator
Operator 75%
Investor
Investor 1%

Reality

Evidence72
Adoption58
Hype gap−20
Incentives68
Confidence68
buildConfirmed14 publishers

Anthropic puts Opus 5.5, Sonnet 5.5 and Mythos 5.1 behind three tiers of cyber verification

Anthropic's Cyber Verification Program now gives security teams three tiers of access to Claude Opus 5.5, Sonnet 5.5 and Mythos 5.1 for defensive work. Getting in takes organization verification and control attestations, and a team learns its tier only from its own admin view.

Perspective Coverage

14 publishers
Builder
Builder 33%
Operator
Operator 47%
Investor
Investor 20%

Reality

Evidence72
Adoption28
Hype gap+22
Incentives62
Confidence70
securityOne report1 publisher

Attackers scan Rejetto HFS servers for a signing-key flaw that grants admin control

VulnCheck says attackers are probing internet-facing Rejetto HFS servers for CVE-2026-61500, a signing-key flaw that gives full administrative control. The bug affects HFS 3.0.0 through 3.2.0, and the fix shipped in 3.2.1.

Reality

Evidence55
Adoption
Not scored
Hype gap+30
Incentives40
Confidence60
securityConfirmed4 publishers

China-based actor targets U.S. Rejetto HFS servers through a forgeable admin cookie

VulnCheck says a China-based actor began targeting vulnerable U.S. Rejetto HFS servers on October 1, exploiting CVE-2026-61500 to forge admin sessions. The fix shipped in July as version 3.2.1. Exposed instances that have not updated are reachable now.

Perspective Coverage

4 publishers
Builder
Builder 43%
Operator
Operator 47%
Investor
Investor 10%

Reality

Evidence62
Adoption
Not scored
Hype gap+30
Incentives50
Confidence60
buildOne report1 publisher

Cisco's CVSS 10 firewall-manager bypass is now being exploited to run code as root

Cisco confirmed on September 9 that attackers are exploiting a CVSS 10.0 bypass in its Firewall Management Center to run code as root. CISA added it to its Known Exploited Vulnerabilities list the same day, with a three-day deadline for federal agencies.

Publishers:dev.to

Reality

Evidence62
Adoption
Not scored
Hype gap0
Incentives
Not scored
Confidence64
buildOne report1 publisher

HFS leaks the Math.random() state that signs its admin cookies

Rejetto HFS 3.0.0 through 3.2.0 signs session cookies with a Math.random() key, and five leaked PRNG outputs let an attacker forge an admin session. Exploitation began on October 1, and version 3.2.1 restores secure key generation.

Publishers:dev.to

Reality

Evidence70
Adoption72
Hype gap0
Incentives50
Confidence65
buildOne report1 publisher

vm2's prefix allowlist let one approved module load its unapproved siblings

vm2's maintainer patched a CVSS 9.5 flaw in 3.12.2 where the module allowlist matched an approved path as a bare prefix and cleared a neighboring package. With NodeVM's default host context, the unapproved sibling ran with full Node authority.

Publishers:dev.to

Reality

Evidence62
Adoption
Not scored
Hype gap+8
Incentives
Not scored
Confidence58
buildOne report1 publisher

Two known-exploited Chromium V8 bugs lead September's 36 device CVEs beyond the kernel

TECH VEDA counts 36 actionable device CVEs across 14 non-kernel packages in September, two of them Chromium V8 bugs on CISA's exploited list. How many apply to a given fleet depends on each image's SBOM and on which scorer a team trusts.

Publishers:dev.to

Reality

Evidence55
Adoption
Not scored
Hype gap+5
Incentives
Not scored
Confidence50
securityConfirmed5 publishers

Exploited within hours: MLflow SSRF and FUXA auth bypass join the emergency patch list

watchTowr says attackers are already pulling cloud credentials through MLflow's Tracking Server, and VulnCheck logged scanning against a FUXA path traversal a day later.

Perspective Coverage

5 publishers
Builder
Builder 29%
Operator
Operator 63%
Investor
Investor 8%

Reality

Evidence72
Adoption55
Hype gap+20
Incentives35
Confidence70
securityConfirmed4 publishers

NASA's AIT-GUI Ground Console Shipped Without Auth: CVSS 9.4, Fixed in 2.5.2

A flaw in NASA's open-source AIT-GUI lets unauthenticated requests reach spacecraft command routes, and Cycode says a malicious web page can deliver them through an operator's browser.

Perspective Coverage

4 publishers
Builder
Builder 43%
Operator
Operator 50%
Investor
Investor 7%

Reality

Evidence70
Adoption
Not scored
Hype gap+30
Incentives45
Confidence65
securityConfirmed4 publishers

Detections on VulnCheck's canaries climb from 50 to 360 amid Langflow, Rails exploitation

The probes read Langflow's secret key file and grep the process environment for OpenAI and AWS credentials, which puts an AI orchestration tool on the same scanning clock as the Rails file-read bug of the same week.

Perspective Coverage

4 publishers
Builder
Builder 30%
Operator
Operator 60%
Investor
Investor 10%

Reality

Evidence62
Adoption40
Hype gap+15
Incentives65
Confidence60
securityConfirmed2 publishers

FBI disrupts the Nanjing contractor that sold QScan and QTRouter to Chinese espionage operators

QTYF built and ran the scanning and routing frameworks other Chinese teams pointed at U.S. critical infrastructure. That means the proxy addresses and scan fingerprints in your logs point to the supplier; the intruder behind them stays unnamed.

Perspective Coverage

3 publishers
Builder
Builder 23%
Operator
Operator 58%
Investor
Investor 19%

Reality

Evidence55
Adoption
Not scored
Hype gap+10
Incentives
Not scored
Confidence60
securityConfirmed3 publishers

CISA reframes the CVE program around data quality as 2026 heads for 96,000 records

Disclosure volume is climbing faster than the process around it. CISA's answer is a framework that describes what a good CVE record is and how the program should be judged on producing one.

Perspective Coverage

3 publishers
Builder
Builder 33%
Operator
Operator 50%
Investor
Investor 17%

Reality

Evidence68
Adoption
Not scored
Hype gap+30
Incentives55
Confidence66
buildOne report1 publisher

A crafted HTTP request runs as root on the console that pushes every Cisco firewall's policy

Cisco Talos says three separate clusters, one sharing tooling with Sandworm, worked the same CVSS 10.0 bypass in Secure Firewall Management Center. The scope change in that vector reaches every firewall the console manages.

Publishers:dev.to

Reality

Evidence72
Adoption61
Hype gap+8
Incentives38
Confidence68

Earlier coverage

  1. An all-zero MAC address bypasses the root command check in ZBT-derived white-label routers

    Build · August 28, 2026 · Confirmed2 publishers