CVE-2026-88771

CVE: Citrix NetScaler Improper Input Validation Vulnerability: Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
CWE: CWE-119
Published: Citrix | NetScaler
Link: https://www.cve.org/CVERecord?id=CVE-2026-88771

Threat Analysis (Citrix NetScaler Improper Input Validation Vulnerability: Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.)

  1. Impact: An unauthenticated attacker can execute arbitrary commands on the NetScaler, compromising integrity (command execution), potentially exposing confidentiality (accessed data), and causing availability issues if the system crashes.

  2. Affected Components & Attack Surface: Citrix NetScaler ADC and NetScaler Gateway; vulnerability resides in web‑interface input handling. Attack surface is remote (network).

  3. Exploitation Prerequisites: No authentication required; attacker must send a crafted payload to the vulnerable endpoint. Minimal assumption: network reachable, no host‑level blocks.

  4. Detection Ideas & Indicators: Search NetScaler logs for unexpected command execution (e.g., exec); look for ATT&CK T1059 “Command and Scripting Interpreter”; ID CVE‑2026‑88771; abnormal process creation.

  5. Mitigations & Workarounds: Deploy Citrix security patch; disable unnecessary remote administration; apply input sanitization; segment NetScaler behind firewalls.

  6. Verification Steps: Send crafted input to ADC/GS; monitor for command execution; verify patch removes vulnerability (no command runs).

  7. Attack‑Path Sequence:

    sequenceDiagram
 Attacker->>NetScaler ADC: Crafted malicious request
 NetScaler ADC->>NetScaler: Executes command
 NetScaler->>Attacker: No response (success)

CVE-2026-88772

CVE: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability: 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
CWE: CWE-119
Published: Citrix | NetScaler
Link: https://www.cve.org/CVERecord?id=CVE-2026-88772

Threat Analysis (Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability: 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)

  1. Impact: The vulnerability permits remote code execution or denial of service, potentially exposing all network traffic, authentication data, and system resources, thereby violating confidentiality, integrity, and availability.

  2. Affected Components & Attack Surface: Citrix ADC (formerly NetScaler Gateway) and Citrix NetScaler Gateway servers; exposed via HTTP/HTTPS management interfaces, remote management ports, and any unencrypted traffic.

  3. Exploitation Prerequisites: A network attacker with no additional privileges; a crafted request exceeding buffer limits (e.g., oversized payload) can trigger the overflow without authentication.

  4. Detection Ideas & Indicators: Logs of failed access attempts or oversized payloads (e.g., “Too Large” errors); ATT&CK T1190 (Exploit Public‑Facing Application); CVE‑2026‑88772 detection rules in SIEM.

  5. Mitigations & Workarounds: Apply Citrix security update 2026.08 (or later); disable unused services; enforce TLS‑only connections; segment the ADC/Gateway from the internal network.

  6. Verification Steps: Run a vulnerability scanner (e.g., Nessus) against the ADC/Gateway to confirm the CVE; or use an exploit tool to reproduce the buffer overflow and confirm code execution.

  7. Attack‑Path Sequence

    sequenceDiagram
 Attacker->>ADC: Send oversized HTTP request
 ADC->>ADC: Buffer overflow triggers
 ADC->>Remote Code Exec: Executes attacker command
 Remote Code Exec->>Attacker: Executes command

CVE-2026-87902

CVE: WordPress Core Remote File Inclusion Vulnerability: 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.
CWE: CWE-98
Published: WordPress | Core
Link: https://www.cve.org/CVERecord?id=CVE-2026-87902

Threat Analysis (WordPress Core Remote File Inclusion Vulnerability: 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.)

  1. Impact: Remote code execution compromises confidentiality (data theft), integrity (code alteration), and availability (service disruption).

  2. Affected Components & Attack Surface: WordPress core (vulnerable to CVE‑2026‑87902), remote request handling; local .php files outside theme directories are the only source of payload.

  3. Exploitation Prerequisites: Unauthenticated attacker can send a request with a crafted template parameter that references a readable local .php file; no authentication or special configuration required.

  4. Detection Ideas & Indicators: Failed or abnormal template‑resolution logs, elevated file‑access logs for external .php files, suspicious include events; ATT&CK IDs T1195 (File Path Traversal), T1105 (Exploit Public‑Facing Application).

  5. Mitigations & Workarounds: Apply WordPress core patch (6.5.2+), disable the page_template extension, whitelist allowed templates, enforce sanitization, or use a security plugin.

  6. Verification Steps: Using Burp Suite, send a GET request to the vulnerable page with ?template=../../../../etc/passwd.php; confirm that the file content is displayed or an error indicates inclusion.

  7. Attack‑Path Sequence:

    sequenceDiagram
 Attacker->>Web Server: GET request with malicious template param
 Web Server->>WordPress Core: Resolve template
 WordPress Core->>Local .php: Include chosen file
 .php->>PHP Interpreter: Execute remote code
 PHP Interpreter->>Attacker: Execute arbitrary code

CVE-2026-65660

CVE: Microsoft SharePoint Code Injection Vulnerability: Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.
CWE: CWE-94
Published: Microsoft | SharePoint
Link: https://www.cve.org/CVERecord?id=CVE-2026-65660

Threat Analysis (Microsoft SharePoint Code Injection Vulnerability: Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.)

  1. Impact: The vulnerability permits an authenticated user to execute arbitrary code on the SharePoint server, compromising confidentiality (exfiltrated data), integrity (malicious modifications), and availability (service disruption via denial‑of‑service scripts).

  2. Affected Components & Attack Surface: SharePoint Server 2013‑2016, accessed over HTTP/HTTPS, vulnerable to remote code injection via crafted page requests.

  3. Exploitation Prerequisites: Requires the attacker to be logged in (or have a valid session) with at least read permission to the site; the vulnerability is triggered by submitting a malicious payload through a page URL.

  4. Detection Ideas & Indicators: Look for PowerShell commands in SharePoint logs (e.g., C:\ProgramData\Microsoft\SharePoint\Logs\PowerShell.log), repeated failed login attempts, or execution of scripts not authored by the site; MITRE ATT&CK T1086 (Obfuscated/Stored Script).

  5. Mitigations & Workarounds: Deploy Microsoft security updates that include a patch for CVE‑2026‑65660, restrict script execution to approved runtimes, enforce least‑privilege site permissions, and disable external script loading.

  6. Verification Steps: From a test machine, submit a payload via a SharePoint page URL; on unpatched server a PowerShell command runs, on patched server the request returns a generic error without execution.

  7. Attack‑Path Sequence:

    sequenceDiagram
 Attacker->>SharePoint: Authenticated session, valid URL
 SharePoint->>Attacker: Executes malicious payload
 Attacker->>SharePoint: Retrieves result

CVE-2026-67279

CVE: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability: Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.
CWE: CWE-841
Published: MikroTik | RouterOS
Link: https://www.cve.org/CVERecord?id=CVE-2026-67279

Threat Analysis (Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability: Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.)

  1. Impact: Unauthenticated client can open a session channel and send an exec request, potentially leading to remote code execution via chained CVE‑2026‑86060. This compromises confidentiality, integrity, and availability.

  2. Affected Components & Attack Surface: RouterOS versions 7.10‑7.12, HTTP/HTTPS exec endpoint, web interface. Exposure is remote via HTTP POST to /exec.

  3. Exploitation Prerequisites: No authentication required; client must issue an HTTP POST to the router’s exec endpoint with a specific payload.

  4. Detection Ideas & Indicators: Execution logs showing exec requests without a session ID, ATT&CK T1021 (Exploit Public‑Facing Application), HTTP POST to /exec missing auth header.

  5. Mitigations & Workarounds: Upgrade RouterOS to 7.13+, disable the exec endpoint, enforce authentication for exec commands, apply the official patch.

  6. Verification Steps: Use curl -X POST http://router_ip:8000/exec -d '{"cmd":"whoami"}' without auth; observe command execution and router log for the request.

  7. Attack‑Path Sequence:

    sequenceDiagram
 Client->>Router: HTTP POST /exec (no auth)
 Router->>Router: Process exec request
 Router->>Router: Execute vulnerable command
 Router->>Client: ACK