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CVE-2026-67204: BookStack 0 to before 26.05.4
CVE-2026-67204. CVSS 3.1 base score 5.4 (MEDIUM, Vendor/CNA). EPSS 0.00413 (percentile 0.33665), scored 11-Oct-2026.
Affected technology
BookStack · 0 to before 26.05.4
BookStackApp
Description’s affected range: before 26.05.4
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required
What an attacker can do
Authenticated API users with image-update or image-delete permissions can manipulate other users' avatars by exploiting missing content-type restrictions in the Image Gallery API endpoints. Vendor/CNA’s CVSS 4.0 assessment (base score 5.3/10) rates confidentiality impact as none; integrity and availability impact as low.
- CWE
- CWE-863
- CCR priority
- 21.7 /100 (P4)
- CVSS 3.1
- 5.4 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L · Vendor/CNA
- EPSS
- 0.00413 · percentile 0.33665 · 2026-10-11
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-12 16:54:24.294989+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-67204.html