Read the docs
TI-2025-00759 Aliases CVE-2025-0896GHSA-q8wv-5h5r-52rp

Orthanc Server Missing Authentication for Critical Function

Priority MEDIUM 52CWE-306Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Orthanc server prior to version 1.5.8 does not enable basic authentication by default when remote access is enabled. This could result in unauthorized access by an attacker.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02478 84th percentileScored 2026-11-07
Fix Fixed Orthanc server (Orthanc): 1.5.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
OrthancOrthanc serverbefore 1.5.81.5.8Patch availableCNA
  • Orthanc server VendorOrthanc Affected before 1.5.8 Fixed in 1.5.8 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*before 1.5.8VulnerableOrthanc
  • cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:* Versions before 1.5.8 Vulnerable ·Orthanc

Remediation

  • Fix · CNA Orthanc server (Orthanc) Fixed in 1.5.8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-0896
  2. 2026-10-03 Alias added: GHSA-q8wv-5h5r-52rp

References

Advisory 1

  • TI-2026-04766 Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode) CVSS 3.1CRITICAL 9.8
  • TI-2026-04765 Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions CVSS 3.1CRITICAL 9.8
  • TI-2023-16538 Orthanc before 1.12.0 allows authenticated users with access to the Orthanc API to… CVSS 3.1HIGH 8.8
  • TI-2026-04768 Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable) CVSS 3.1CRITICAL 9.1
  • TI-2026-04763 Memory Exhaustion via Unbounded Content-Length CVSS 3.1HIGH 7.5
  • TI-2026-04760 Out-of-Bounds Read in DicomStreamReader CVSS 3.1HIGH 7.5
See all 11 →

Sources

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