Latest security threats we track

Plain-English notes on the critical issues our Safe Scan and Deep Scan look for right now, from our own advisories and CISA's catalog of vulnerabilities attackers are actively exploiting. No fear-mongering: what happened, who is affected, and how to check.

Last refreshed 25 Oct 2026, 01:39 UTC · knowledge base 2026-10-25.1 · CISA KEV catalog 2026.10.23.

Featured threats

In-depth guides to major incidents, with the current status kept up to date.

Critical22 Oct 2026

PHP2Shell (CVE-2026-109618 / CVE-2026-109619)

CVE-2026-109618 · CVE-2026-109619

Critical unauthenticated remote code execution in PHP web runtimes (OOM-handling memory corruption and stale global state). Disclosed October 2026.

Status: Fix available.

Read the advisory
High22 Oct 2026

eMudhra compromised intermediate CAs (October 2026)

Eight eMudhra Global TLS intermediate CA keys were recoverable (weak entropy). Browsers blocked them. Sites chaining through them need a new certificate.

Status: Mitigated.

Read the advisory

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Recently exploited vulnerabilities in web software

Entries added to CISA's Known Exploited Vulnerabilities catalog in the last 60 days that affect common website and web-server software (CMSs, web servers, app frameworks, hosting panels and internet-facing gateways). The 12 most recent of 24.

Known exploitedEdge gateways & VPNsAdded 16 Oct 2026

Fortinet Multiple Products Path Traversal Vulnerability (CVE-2025-61624)

FortiOS, FortiPAM, FortiProxy, and FortiSwitchManager contain a path traversal vulnerability that may allow an authenticated attacker with admin profile and at least read-write permissions to write or delete arbitrary files via specific CLI commands.

Who should check: anyone running Fortinet Multiple Products on a server or appliance reachable from the internet.

How to check: look up the Multiple Products version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2025-61624 · CISA KEV

Known exploitedAtlassianAdded 15 Oct 2026

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability (CVE-2026-21589)

Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.

Who should check: anyone running Atlassian Multiple Products on a server or appliance reachable from the internet.

How to check: look up the Multiple Products version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan includes a nuclei template for this CVE and checks your verified domain for it.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-21589 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 14 Oct 2026

Palo Alto Networks PAN-OS Code Injection Vulnerability (CVE-2026-0322)

Palo Alto Networks PAN-OS contains a code injection vulnerability that could allow an authenticated attacker with network access to execute arbitrary code with root privileges on the firewall.

Who should check: anyone running Palo Alto Networks PAN-OS on a server or appliance reachable from the internet.

How to check: look up the PAN-OS version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-0322 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 13 Oct 2026

Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability (CVE-2026-104935)

Ivanti Connect Secure contains an authentication bypass by spoofing vulnerability that allows a remote unauthenticated attacker to execute arbitrary commands.

Who should check: anyone running Ivanti Connect Secure on a server or appliance reachable from the internet.

How to check: look up the Connect Secure version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan includes a nuclei template for this CVE and checks your verified domain for it.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-104935 · CISA KEV

Known exploitedStrapiAdded 8 Oct 2026

Strapi Cleartext Storage of Sensitive Information Vulnerability (CVE-2023-22894)

Strapi contains a cleartext storage of sensitive information vulnerability that could allow attackers with access to the admin panel to discover sensitive user details via the query filter. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version. This vulnerability can be chained with CVE-2023-22621 to achieve remote code execution.

Who should check: anyone running Strapi Strapi on a server or appliance reachable from the internet.

How to check: look up the Strapi version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2023-22894 · CISA KEV

Known exploitedApacheAdded 8 Oct 2026

Apache Struts Command Injection Vulnerability (CVE-2016-3081)

Apache Struts contains a command injection vulnerability that could allow remote attackers to execute arbitrary code via method:prefix when Dynamic Method Invocation is enabled.

Who should check: anyone running Apache Struts on a server or appliance reachable from the internet.

How to check: look up the Struts version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan includes a nuclei template for this CVE and checks your verified domain for it.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2016-3081 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 4 Oct 2026

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2026-88779)

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

Who should check: anyone running Citrix NetScaler on a server or appliance reachable from the internet.

How to check: look up the NetScaler version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-88779 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 1 Oct 2026

Fortinet FortiMail Path Traversal Vulnerability (CVE-2026-104286)

Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

Who should check: anyone running Fortinet FortiMail on a server or appliance reachable from the internet.

How to check: look up the FortiMail version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-104286 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 27 Sept 2026

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2026-88772)

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service

Who should check: anyone running Citrix NetScaler on a server or appliance reachable from the internet.

How to check: look up the NetScaler version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-88772 · CISA KEV

Known exploitedEdge gateways & VPNsAdded 27 Sept 2026

Citrix NetScaler Improper Input Validation Vulnerability (CVE-2026-88771)

Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.

Who should check: anyone running Citrix NetScaler on a server or appliance reachable from the internet.

How to check: look up the NetScaler version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-88771 · CISA KEV

Known exploitedWordPressAdded 25 Sept 2026

WordPress Core Remote File Inclusion Vulnerability (CVE-2026-87902)

WordPress Core contains a remote file inclusion vulnerability which could allow an unauthenticated attacker to make page-template resolution include a chosen readable local `.php` file outside the active theme directories, leading to remote code execution.

Who should check: anyone running WordPress Core on a server or appliance reachable from the internet.

How to check: look up the Core version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan includes a nuclei template for this CVE and checks your verified domain for it.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-87902 · CISA KEV

Known exploitedMicrosoft web serversAdded 25 Sept 2026

Microsoft SharePoint Code Injection Vulnerability (CVE-2026-65660)

Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.

Who should check: anyone running Microsoft SharePoint on a server or appliance reachable from the internet.

How to check: look up the SharePoint version you run (admin console, package manager or your host) and compare it with the fixed release in the vendor advisory. Our Deep Scan runs the community nuclei templates for this product, which update daily as new checks are published.

What to do: apply the vendor's update or mitigation now. If you can't patch yet, take the service off the public internet until you can.

References: NVD CVE-2026-65660 · CISA KEV

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