# CVE-2026-55147: LORIS has incorrect access checks in API for Imaging Browser

Status: published. Published: 2026-10-30. Updated: 2026-11-02.

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. In versions from 22.0.0 prior to 27.0.4 and from 28.0.0 prior to 28.0.2, the `API` for the `imaging_browser` module permits edits to imaging data without checking the frontend permissions that restrict editing in Imaging Browser. An authenticated `API` caller can therefore modify imaging data without the required edit authorization. Deployments that no longer use the `API` can disable it to remove access to this endpoint. This issue is fixed in versions 27.0.4 and 28.0.2.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- aces / Loris: >= 22.0.0, < 27.0.4 (affected); >= 28.0.0, < 28.0.2 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-02; percentile 11.92%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/aces/Loris/security/advisories/GHSA-m48r-jv24-jjcx (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/aces/Loris/pull/10531 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/aces/Loris/commit/b13053597530ee33fbced35085d2490bc9ccc03a (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/aces/Loris/releases/tag/v27.0.4 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/aces/Loris/releases/tag/v28.0.2 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-55147; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-55147; retrieved 2026-11-02; source updated Not reported

Revision: 34c273b509a88c5f705a356e65e1bb3c1470c94121c6adf7fa88f25d4e82c775

Canonical: https://y2.dev/cve/CVE-2026-55147

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.