CVE-2025-50738 Scanner

The Memos software, used by developers for note-taking and collaboration, is designed to help users manage and share their ideas in a seamless manner. It is widely adopted by teams looking for an efficient way to store and retrieve information. Being open-source, Memos also attracts contributors and users who want to customize and expand its functionalities. Its primary utility includes organizing resources, enhancing productivity, and supporting various file types. Overall, Memos provides a robust platform for effective team collaboration and information management. Vulnerabilities like the one found in its system can impede these objectives, making its secure operation crucial.

The Cross-Site Scripting (XSS) vulnerability impacts user-generated content functionalities within Memos. Specifically, the issue arises from insufficient sanitization of SVG files uploaded by authenticated users. This flaw allows attackers to inject and execute arbitrary JavaScript code in the context of other users accessing the vulnerable resources. As a stored variant of XSS, the malicious script is triggered whenever any user interacts with the compromised content. This creates significant security risks, including credential theft and session hijacking. The wide impact potential amplifies the need for prompt resolution.

The vulnerability is specifically related to the handling of SVG files within the Memos application, versions prior to 0.25.0. Attackers can craft SVG files that, upon uploading, include embedded JavaScript. Once stored in the application, this script executes whenever a user accesses the file via a web browser. A crucial factor is that this occurs despite the user's privilege level because the execution context depends on what the targeted viewer sees. The templates exploit this by utilizing POST requests to upload files and another series of actions to confirm code execution. Its operation exposes significant weaknesses in user input handling.

This XSS vulnerability, if exploited, could lead to devastating consequences for both users and operators of Memos. Possible effects include unauthorized access to sensitive information like session tokens or cookies. Attackers could leverage this to impersonate users or escalate privileges without authorization. Moreover, it may facilitate secondary attacks such as phishing, further breaching user trust. Businesses relying on Memos could face data integrity concerns and reputational damage. Thus, timely patching of such vulnerabilities is crucial to uphold security.

REFERENCES

• https://github.com/usememos/memos/issues/4707
• https://github.com/advisories/GHSA-hfcf-79gh-f3jc
• https://nvd.nist.gov/vuln/detail/CVE-2025-50738