Is CVE-2021-40888 actively exploited?

No active exploitation of CVE-2021-40888 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-40888 be exploited remotely?

Yes. CVE-2021-40888 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-40888?

CVE-2021-40888 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2021-40888

CWE-79Published: October 11, 2021· Updated: Jun 17, 2026

5.4

CVSS v3.1

Official Description

Projectsend version r1295 is affected by Cross Site Scripting (XSS) due to lack of sanitization when echo output data in returnFilesIds() function. A low privilege user can call this function through process.php file and execute scripting code.

NVD Source

Technical Analysis

CVE-2021-40888 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.