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
The vulnerability in aces Loris (CVE-2026-35403) involves improper neutralization of input during web page generation (CWE-79). When a user supplies an invalid visit label in the survey_accounts module, the application fails to set the Content-Type header, causing the browser to interpret JSON-encoded data as HTML. This misinterpretation can enable a cross-site scripting attack if a user is tricked into clicking a malicious link. The flaw affects versions >= 15.10 and < 27.0.3, and >= 28.0.0 and < 28.0.1. The issue has been 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 partial confidentiality impact (e.g., exposure of sensitive information) and limited integrity impact. Availability is not affected. The attack requires user interaction (clicking a crafted link) and has a high attack complexity due to the need to trick users. Privileges required are low, and the vulnerability affects the confidentiality of data accessible to the user.
Mitigation Recommendations
This vulnerability is fixed in aces Loris versions 27.0.3 and 28.0.1. Users should upgrade to one of these versions or later to remediate the issue. No other vendor advisory or patch information is provided, so patch status beyond these versions is not confirmed. Until upgraded, users should be cautious of invalid links that could trigger this XSS vulnerability.
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
The vulnerability in aces Loris (CVE-2026-35403) involves improper neutralization of input during web page generation (CWE-79). When a user supplies an invalid visit label in the survey_accounts module, the application fails to set the Content-Type header, causing the browser to interpret JSON-encoded data as HTML. This misinterpretation can enable a cross-site scripting attack if a user is tricked into clicking a malicious link. The flaw affects versions >= 15.10 and < 27.0.3, and >= 28.0.0 and < 28.0.1. The issue has been 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 partial confidentiality impact (e.g., exposure of sensitive information) and limited integrity impact. Availability is not affected. The attack requires user interaction (clicking a crafted link) and has a high attack complexity due to the need to trick users. Privileges required are low, and the vulnerability affects the confidentiality of data accessible to the user.
Mitigation Recommendations
This vulnerability is fixed in aces Loris versions 27.0.3 and 28.0.1. Users should upgrade to one of these versions or later to remediate the issue. No other vendor advisory or patch information is provided, so patch status beyond these versions is not confirmed. Until upgraded, users should be cautious of invalid links that could trigger this XSS vulnerability.
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: 4/9/2026, 5:21:03 AM
Last updated: 4/10/2026, 8:26:54 AM
Views: 8
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