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TI-2026-83419 Aliases CVE-2026-55147

LORIS imaging browser API lacks edit authorization checks

Priority LOW 27CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

LORIS from 22.0.0 before 27.0.4 and from 28.0.0 before 28.0.2 is affected. The API for the imaging_browser module does not check the frontend permissions that restrict editing (CWE-862). An authenticated API caller can modify imaging data without the required edit authorization.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00215 11th percentileScored 2026-11-07
Fix Fixed Loris (aces): 27.0.4, 28.0.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
acesLoris22.0.0 to before 27.0.4; 28.0.0 to before 28.0.227.0.4, 28.0.2Patch availableCNA
  • Loris Vendoraces Affected 22.0.0 to before 27.0.4; 28.0.0 to before 28.0.2 Fixed in 27.0.4, 28.0.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mcgill:loris:*:*:*:*:*:*:*:*——aces
  • cpe:2.3:a:mcgill:loris:*:*:*:*:*:*:*:* Versions — — ·aces

Remediation

Upgrade LORIS to version 27.0.4 or 28.0.2. Deployments that no longer use the API can disable it to remove access to this endpoint.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA Loris (aces) Fixed in 27.0.4, 28.0.2

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-55147
  2. 2026-11-01 Priority changed: MEDIUM → LOW
  3. 2026-11-02 CISA SSVC decision points changed

References

Other 5

  • TI-2026-21463 LORIS media module vulnerable to remote code execution CVSS 3.1HIGH 8.8
  • TI-2026-27323 LORIS has potential cross-site scripting in help_editor module CVSS 3.1HIGH 8.7
  • TI-2026-26678 LORIS has a path traversal in static router CVSS 3.1HIGH 7.5
  • TI-2026-25756 LORIS has a SQL injection in MRI feedback popup CVSS 3.1HIGH 7.5
  • TI-2026-27577 LORIS has a path traversal in FilesDownloadHandler CVSS 3.1HIGH 8.6
  • TI-2026-21464 LORIS vulnerable to path traversal in electrophysiology_browser CVSS 3.1HIGH 8.1
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences