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    CVE-2026-65646

    Improper neutralization of special elements in Plesk allows remote authenticated users to disclose arbitrary local files and escalate privileges.

    Published:Aug 26, 2026
    Last Modified:Aug 27, 2026
    EPS:Aug 26, 2026
    EPSS Score:0.00285
    CVSS Score:8.7

    Affected Products

    Vendor
    Webpros
    Product
    Plesk

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-105 HTTP Request Splitting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-273 HTTP Response Smuggling
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-34 HTTP Response Splitting
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-51 Poison Web Service Registry
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-6 Argument Injection
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-83 XPath Injection
    CAPEC-84 XQuery Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-68487 (CVSS 9.9) — Path traversal in Plesk's Backup Manager causes arbitrary file write as root by an authenticated customer.…
    CVE-2026-68488 (CVSS 9.9) — A Time-of-check Time-of-use (TOCTOU) race condition leading to insecure symlink following in Plesk causes loca…
    CVE-2026-67397 (CVSS 8.5) — Path traversal in Plesk 18.0.79.9 and earlier and 18.0.80 through 18.0.80.5 allows local users to execute arbi…
    CVE-2026-67394 (CVSS 9) — A critical local privilege escalation via OS command injection vulnerability has been discovered in Plesk for …
    CVE-2026-65642 (CVSS 8.6) — Insecure direct object reference in Plesk 18.0.79.7 and earlier or 18.0.80 through 18.0.80.3, allows remote au…
    CVE-2026-64639 (CVSS 9.3) — Incorrect database cloning process in Plesk from 18.0.52 before 18.0.79.6 and 18.0.80.2 allows a low-privilege…
    CVE-2026-64637 (CVSS 9.9) — Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to …
    CVE-2026-64636 (CVSS 7.7) — An SQL injection vulnerability in Plesk Obsidian up to 18.0.80 for Linux and Windows allows an authenticated u…
    CVE-2026-58046 (CVSS 9.9) — Improper neutralization in the Plesk XML-RPC API allows a remote authenticated low-privileged user to perform …
    CVE-2026-56843 (CVSS 9.9) — Incorrect authorization in the XML-RPC API of WebPros Plesk before 18.0.78.4 allows a low-privileged authentic…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High