CVE-2023-6199Public exploitNetwork attack vector

Server file disclosure via image source misinterpretation

Published Nov 20, 2023 · Updated May 19, 2025

SSRF in BookStack 23.10.2 image handling allows remote authenticated users to read server files through crafted page content. ImageResizer passes attacker-controlled decoded image data to Intervention Image's generic make method, which interprets URL or file-path strings as sources instead of fixed binary content. Writer permission to create or edit page content is required; successful exploitation discloses files readable by the BookStack server process.

CVSS severity6.5
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in BookStack 23.10.2 image handling allows remote authenticated users to read server files through crafted page content. ImageResizer passes attacker-controlled decoded image data to Intervention Image's generic make method, which interprets URL or file-path strings as sources instead of fixed binary content. Writer permission to create or edit page content is required; successful exploitation discloses files readable by the BookStack server process.

The record

CVE
CVE-2023-6199
Published
Nov 20, 2023
Updated
May 19, 2025
Vendor
BookStack
Product
BookStack
Classifications
CWE-918, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 20, 2023CVE publishedPublication date reported by the CVE source.
  2. May 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=23.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BookStack · BookStackversion=23.10.2

Published CVSS scores

6.5Fluid AttacksCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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