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  4. CVE 2026 116020 bookstack before 26092 incorrect authorization
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-116020

BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft PagesCVE-2026-116020

Answer in brief

CVE-2026-116020 records a Medium severity (CVSS 5.3) vulnerability in BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft Pages. The current sources do not mark it as known exploited. The current feed maps BookStackApp/BookStack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 24, 2026Updated Oct 24, 2026Source checked Oct 24, 2026First seen by HOL Oct 24, 2026Material review Oct 24, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-863
Source
CVE List V5
Source checked
Oct 24, 2026
References
5 linked sources
Open source record

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps BookStackApp/BookStack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
BookStackApp/BookStackgeneric>=0 <26.09.226.09.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for BookStackApp/BookStack.
  2. 2Review the reported fix. Update BookStackApp/BookStack to 26.09.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 24, 2026

Sources and claim methodology

  • Source referencecodeberg.org
  • Source referencecodeberg.org
  • Source referencecodeberg.org
  • Source referencebookstackapp.com
  • Source referencevulncheck.com
Upstream source description

BookStack before 26.09.2 contains an incorrect authorization vulnerability in AttachmentController that allows authenticated users to access other users' draft page attachments by ID. Attackers with attachment permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.

Quoted source text, attributed separately from HOL analysis.