EXECUTIVE SUMMARY:
A critical security flaw has been identified in a widely used multi-page document viewer, creating a high-risk remote code execution vulnerability across multiple operating system distributions. By exploiting this flaw through social engineering, an attacker can achieve arbitrary code execution under the context of the active local user with a single click. While a formal CVSS score has not been officially finalized in the provided reference, vulnerabilities of this nature—enabling full remote code execution via a single user interaction—typically inherit a critical severity rating with base scores ranging from 7.8 to 8.8, reflecting high impact on system confidentiality, integrity, and availability. Because full technical details and proof-of-concept exploit code are publicly available, the risk of immediate exploitation is significantly elevated for unpatched systems.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
A critical security flaw has been identified in a widely used multi-page document viewer, creating a high-risk remote code execution vulnerability across multiple operating system distributions. By exploiting this flaw through social engineering, an attacker can achieve arbitrary code execution under the context of the active local user with a single click. While a formal CVSS score has not been officially finalized in the provided reference, vulnerabilities of this nature—enabling full remote code execution via a single user interaction—typically inherit a critical severity rating with base scores ranging from 7.8 to 8.8, reflecting high impact on system confidentiality, integrity, and availability. Because full technical details and proof-of-concept exploit code are publicly available, the risk of immediate exploitation is significantly elevated for unpatched systems.[emaillocker id="1283"]
CVE-2026-46529: This remote code execution vulnerability affects the shell component of the document viewer, specifically within its internal application spawn function. The underlying issue stems from improper argument handling where the software builds a command line from user-controlled fields without applying mandatory shell-quoting safety functions. An attacker can exploit this by packaging a malicious payload into a polyglot file that simultaneously functions as both a valid document and an executable shared library. When a user clicks a malicious link inside the document, the system passes the unsanitized input to native application utilities, triggering a library load function that executes arbitrary commands with local user privileges.
To secure workspaces against potential exploitation, administrators must deploy software updates immediately as distribution patches become available, monitor default file-opening associations across all workstations, and instruct users to avoid interacting with unverified hyperlinks embedded within external documents.
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The following reports contain further technical details:
https://securityonline.info/atril-single-click-rce-cve-2026-46529/