The vulnerability identified as CVE-2026-25880 pertains to the SumatraPDF, a multi-format reader for Windows. In versions 3.5.2 and earlier, a flaw allows for the execution of a malicious binary (explorer.exe) that resides in the same directory as the opened PDF. This occurs when a user invokes the File → 'Show in folder' option. The result is arbitrary code execution on the victim’s system with the privileges of the current user, without any warning or additional user interaction required.
The CVSS score for this vulnerability is 7.8, categorizing it as high severity. The implications of this vulnerability are significant, as it allows attackers to execute arbitrary code locally, potentially leading to unauthorized access and control over affected systems.
Organizations should prioritize patching immediately to protect against potential exploitation. The execution of arbitrary code can lead to severe consequences, including data breaches and system compromise.
Currently, there are no known public exploits or proofs of concept available for this vulnerability. However, the nature of the flaw suggests that it could be exploited by attackers, making timely remediation crucial.
Organizations must remain vigilant and ensure that they are using the latest version of SumatraPDF to mitigate risks associated with this vulnerability.
The vulnerability was published on February 9, 2026, and the last modification was made on February 23, 2026. Understanding the details and implications of CVE-2026-25880 is essential for maintaining security and protecting organizational assets.
Vulnerability Details
The CVE-2026-25880 vulnerability allows execution of a malicious binary located in the same directory as the opened PDF. The official CVE description outlines that the flaw exists in versions 3.5.2 and earlier of the SumatraPDF application. The attack vector is classified as local, with a low complexity requirement and no privileges needed to exploit it.
The impact of this vulnerability is classified as high across confidentiality, integrity, and availability. The CWE classification for this vulnerability is CWE-426, indicating an untrusted search path issue.
Technical Analysis
The root cause of this vulnerability lies in the way SumatraPDF handles file paths and executes binaries. When a user selects the option to show a PDF in its folder, the application inadvertently executes a binary if it resides in the same directory. This behavior exposes users to arbitrary code execution risks, as attackers could place malicious binaries in the same directory as PDFs.
The attack vector is local, requiring physical access or prior access to the system. The low attack complexity means that exploitation does not require advanced skills, making it accessible to a broader threat actor base. User interaction is required to initiate the code execution, which adds a layer of dependency on user behavior.
Given the potential impacts, organizations using SumatraPDF should be aware of the risks and ensure that security measures are in place to mitigate the exploitation of this vulnerability.
Risk & Impact Analysis
Risk to organizations includes unauthorized access and the potential for data breaches. Since this vulnerability allows arbitrary code execution with the privileges of the current user, the blast radius could be extensive, affecting not only the compromised system but also any connected systems.
Organizations should address this vulnerability in their priority patch cycle due to its high severity rating and the potential consequences of exploitation. Given that the EPSS score is extremely low, the immediate risk of exploitation may be low, but the potential for future exploitation remains.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected, specifically versions 3.5.2 and earlier of SumatraPDF. Organizations should ensure they have upgraded to the latest version to mitigate risks associated with this vulnerability.
Mitigation & Remediation
To mitigate this vulnerability, organizations should patch SumatraPDF to the latest version immediately. If patches are not available, users should consider alternatives or temporary workarounds such as disabling the 'Show in folder' functionality if possible.
For further assistance, organizations can consult our penetration testing services to validate the security of their systems.
Detection Guidance
Organizations should monitor logs for unusual file execution patterns, especially those involving PDF files. Behavioral anomalies, such as unexpected application launches after user interactions with PDF files, should be flagged and investigated.
Network signatures should also be updated to detect any unusual outbound connections initiated by the PDF reader, particularly after executing commands following user interactions.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-25880 highlights the risks associated with local execution vulnerabilities, which can have substantial impacts if left unaddressed. This incident represents a pattern where user interaction is leveraged to bypass security mechanisms.
Security teams should take this as a lesson to review their local execution policies and ensure user awareness regarding potential risks when interacting with files from unverified sources.
For more detailed strategies on securing your applications, consider reviewing our vulnerability management program or our penetration testing methodology guides.
Lastly, stay informed about emerging vulnerabilities in applications by subscribing to our updates on ransomware targeting trends and other cyber threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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