CVE-2026-5484

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.32% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 24.9% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-07-20.

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

2026-04-03 19:45Z5 MO AGO

Last updated

2026-04-08 18:52Z4 MO AGO

Reserved

2026-04-03

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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

576bc94307d663b6919325acf30d3c0e411bf2fcf54ef95cc7b2250c28242954

• vuldb.comVDB-355091 | BookStackApp BookStack Chapter Export ExportFormatter.php chapterToMarkdown access controlhttps://vuldb.com/vuln/355091vdb-entrytechnical-description
• vuldb.comVDB-355091 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/355091/ctisignaturepermissions-required
• vuldb.comSubmit #781762 | BookstackApp BookStack v25.12.9 Improper Access Controlshttps://vuldb.com/submit/781762third-party-advisory
• github.comhttps://github.com/Ghufran2/CVE-Bookstack/blob/main/Permission%20Bypass%20in%20Markdown%20Chapter%20Exportexploit
• www.bookstackapp.comhttps://www.bookstackapp.com/blog/bookstack-release-v26-03-1/related
• github.comhttps://github.com/BookStackApp/BookStack/commit/8a59895ba063040cc8dafd82e94024c406df3d04patch
• github.comhttps://github.com/BookStackApp/BookStack/releases/tag/v26.03.1patch
• github.comhttps://github.com/BookStackApp/BookStack/product