CVE-2026-35403

LORIS has potential cross-site scripting in survey_accounts module

MEDIUM
5.4
CVSS Score
Published: April 8, 2026 at 06:27 PM UTC
Updated: July 24, 2026 at 09:20 PM UTC
2 products affected across 2 vendorsLorisLoris

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

15.10 ≤ v ≤ 27.0.228.0.0
v < 27.0.3v < 28.0.1
Affected range stops below 27.0.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 28.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/aces/Loris/security/advisories/GHSA-776p-5pwh-vc8p

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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