Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M

CVE-2026-35403LORIS has potential cross-site scripting in survey_accounts module

Medium 6.5

In plain English

A medium-severity cross-site scripting in Loris from aces. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 93.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
aces	Loris	>= 15.10, < 27.0.3>= 28.0.0, < 28.0.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N

References

https://github.com/aces/Loris/security/advisories/GHSA-776p-5pwh-vc8p x_refsource_CONFIRM