CVE-2024-39899Public exploitNetwork attack vector

Unauthenticated URL shortening via substring-only origin check

Published Jul 9, 2024 · Updated Aug 2, 2024

Authentication bypass in PrivateBin 1.5.0 through 1.7.3 allows remote attackers to shorten third-party URLs through a private YOURLS service. The YourlsProxy constructor uses strpos as a containment test for the configured basepath, so a crafted URL passes when that string occurs in its query or fragment rather than at offset zero. Exposure requires URL shortening, an authenticated private YOURLS service, a configured basepath, proxy, and token; generated links can conceal external phishing destinations, but existing pastes, configuration, and the token remain undisclosed.

CVSS severity5.3
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in PrivateBin 1.5.0 through 1.7.3 allows remote attackers to shorten third-party URLs through a private YOURLS service. The YourlsProxy constructor uses strpos as a containment test for the configured basepath, so a crafted URL passes when that string occurs in its query or fragment rather than at offset zero. Exposure requires URL shortening, an authenticated private YOURLS service, a configured basepath, proxy, and token; generated links can conceal external phishing destinations, but existing pastes, configuration, and the token remain undisclosed.

The record

CVE
CVE-2024-39899
Published
Jul 9, 2024
Updated
Aug 2, 2024
Vendor
PrivateBin
Product
PrivateBin
Classifications
CWE-20, CWE-791, CWE-305, T1608.005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=>= 1.5.0, < 1.7.4
  2. Affected versionversion=1.5.0 <1.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PrivateBin · PrivateBinversion=>= 1.5.0, < 1.7.4; version=1.5.0 <1.7.4

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-791Incomplete Filtering of Special Elements
CWE-305Authentication Bypass by Primary Weakness
T1608.005Link Target

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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