CVE-2025-41084
Unknown Unknown - Not Provided
Stored XSS in Sesame via Unsanitized SVG Logo Upload

Publication date: 2026-01-20

Last updated on: 2026-01-20

Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)

Description
Stored Cross-Site Scripting (XSS) vulnerability in Sesame web application, due to the fact that uploaded SVG images are not properly sanitized. This allows attackers to embed malicious scripts in SVG files by sending a POST request using the 'logo' parameter in '/api/v3/companies/<ID>/logo', which are then stored on the server and executed in the context of any user who accesses the compromised resource.
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Meta Information
Published
2026-01-20
Last Modified
2026-01-20
Generated
2026-06-16
AI Q&A
2026-01-20
EPSS Evaluated
2026-06-15
NVD
CVE-2025-41084
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
unknown_vendor sesame *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Impact Analysis

This vulnerability can impact you by allowing attackers to execute malicious scripts in the context of users who access the compromised resource. This can lead to unauthorized actions, data theft, session hijacking, or other malicious activities performed on behalf of the user, potentially compromising user accounts and sensitive information. [1]

Executive Summary

CVE-2025-41084 is a stored Cross-Site Scripting (XSS) vulnerability in the Sesame web application. It occurs because uploaded SVG images are not properly sanitized. Attackers can send a POST request to the '/api/v3/companies/<ID>/logo' endpoint using the 'logo' parameter to upload malicious SVG files containing embedded scripts. These scripts are then stored on the server and executed in the context of any user who accesses the compromised resource, potentially allowing script execution attacks. [1]

Detection Guidance

This vulnerability can be detected by monitoring for POST requests to the endpoint `/api/v3/companies/<ID>/logo` that include SVG files uploaded via the 'logo' parameter. Inspecting these SVG files for embedded scripts can help identify malicious payloads. Network monitoring tools or web application firewalls (WAF) can be configured to log or alert on such requests. Specific commands are not provided in the available resources. [1]

Mitigation Strategies

Immediate mitigation steps include restricting or monitoring uploads of SVG files to the `/api/v3/companies/<ID>/logo` endpoint, implementing input validation and sanitization for uploaded SVG images, and applying strict access controls to limit who can upload logos. Since no patch or solution has been reported yet, monitoring and restricting potentially malicious uploads is critical. [1]

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