CVE-2026-35403: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in aces Loris
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 15.10 to before 27.0.3 and 28.0.1, there is a potential for a cross-site scripting attack in the survey_accounts module if a user provides an invalid visit label. While the data is properly JSON encoded, the Content-Type header is not set causing the web browser to interpret the payload as HTML, opening the possibility of a cross-site scripting if a user is tricked into following an invalid link. This vulnerability is fixed in 27.0.3 and 28.0.1.
AI Analysis
Technical Summary
CVE-2026-35403 describes a cross-site scripting vulnerability in the LORIS web application, specifically in the survey_accounts module. The vulnerability occurs when an invalid visit label is provided by a user. Although the input is JSON encoded, the absence of the Content-Type header causes the browser to interpret the payload as HTML, enabling potential XSS attacks. This affects versions >= 15.10 and < 27.0.3, and >= 28.0.0 and < 28.0.1. The issue is resolved in versions 27.0.3 and 28.0.1.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser session, potentially leading to data exposure or session hijacking. The vulnerability requires user interaction (UI:R) and has a high impact on confidentiality, low on integrity, and no impact on availability. The attack complexity is high and requires low privileges.
Mitigation Recommendations
Upgrade affected LORIS installations to version 27.0.3 or 28.0.1 or later, where this vulnerability is fixed. Since this is a self-hosted application, administrators must apply these updates manually. Patch status is confirmed fixed in these versions. No additional vendor advisory was provided.
CVE-2026-35403: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in aces Loris
Description
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 15.10 to before 27.0.3 and 28.0.1, there is a potential for a cross-site scripting attack in the survey_accounts module if a user provides an invalid visit label. While the data is properly JSON encoded, the Content-Type header is not set causing the web browser to interpret the payload as HTML, opening the possibility of a cross-site scripting if a user is tricked into following an invalid link. This vulnerability is fixed in 27.0.3 and 28.0.1.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-35403 describes a cross-site scripting vulnerability in the LORIS web application, specifically in the survey_accounts module. The vulnerability occurs when an invalid visit label is provided by a user. Although the input is JSON encoded, the absence of the Content-Type header causes the browser to interpret the payload as HTML, enabling potential XSS attacks. This affects versions >= 15.10 and < 27.0.3, and >= 28.0.0 and < 28.0.1. The issue is resolved in versions 27.0.3 and 28.0.1.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser session, potentially leading to data exposure or session hijacking. The vulnerability requires user interaction (UI:R) and has a high impact on confidentiality, low on integrity, and no impact on availability. The attack complexity is high and requires low privileges.
Mitigation Recommendations
Upgrade affected LORIS installations to version 27.0.3 or 28.0.1 or later, where this vulnerability is fixed. Since this is a self-hosted application, administrators must apply these updates manually. Patch status is confirmed fixed in these versions. No additional vendor advisory was provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-02T17:03:42.074Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d736f91cc7ad14da418a5d
Added to database: 4/9/2026, 5:19:53 AM
Last enriched: 4/16/2026, 11:58:56 AM
Last updated: 5/25/2026, 12:44:59 AM
Views: 40
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