CVE-2026-86285

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

Not scored by EPSS

EPSS percentile

Not scored by EPSS

NVD base score

The NVD has published no score for this record

NVD CVSS vector

No NVD score to derive

NVD analysis status

Not recorded

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-07 08:15Z1 HR AGO

Last updated

2026-09-07 08:15Z1 HR AGO

Reserved

2026-09-06

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-266Incorrect Privilege AssignmentBase
• CWE-284Improper Access ControlPillar

Data version

5.2

Document digest

5963334bc7efdab72eac3a7bfb065b46928c74d25fe63d12db92ba303cdb8775

• vuldb.comVDB-399445 | BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access controlhttps://vuldb.com/vuln/399445vdb-entrytechnical-description
• vuldb.comVDB-399445 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/399445/ctisignaturepermissions-required
• vuldb.comCVE-2026-86285 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-86285third-party-advisory
• vuldb.comSubmit #905693 | BookStack 26.05.2 Missing authorization / Broken Access Controlhttps://vuldb.com/submit/905693third-party-advisory
• ashutosh-jena.inhttps://ashutosh-jena.in/blog/broken-access-control-in-bookstack-how-a-missing-permission-check-leaked-attachment-dataexploit
• codeberg.orghttps://codeberg.org/bookstack/bookstack/commit/4e406c41c4c8060a5795e74c66fb96362e54f400patch