CVE-2023-42804Network attack vector

Server file disclosure via presentation path traversal

Published Oct 30, 2023 · Updated Sep 5, 2024

Path traversal in BigBlueButton before 2.6.0-beta.1 allows remote attackers to read certain server files through presentation URLs. The bbb-web presentation URL mapping accepted traversal characters in path parameters, allowing resolution outside the intended presentation directory. A request requires a valid starting folder path, and disclosure is limited to files with txt, swf, svg, or png extensions.

CVSS severity3.1
Low
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in BigBlueButton before 2.6.0-beta.1 allows remote attackers to read certain server files through presentation URLs. The bbb-web presentation URL mapping accepted traversal characters in path parameters, allowing resolution outside the intended presentation directory. A request requires a valid starting folder path, and disclosure is limited to files with txt, swf, svg, or png extensions.

The record

CVE
CVE-2023-42804
Published
Oct 30, 2023
Updated
Sep 5, 2024
Vendor
BigBlueButton Inc.
Product
BigBlueButton
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 2024Record 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=< 2.6.0-beta.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BigBlueButton Inc. · BigBlueButtonversion=< 2.6.0-beta.1

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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