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Access of Resource Using Incompatible Type ('Type Confusion') in yourls/yourls

Critical severity GitHub Reviewed Published Sep 22, 2019 in YOURLS/YOURLS • Updated Jun 8, 2026

Package

composer yourls/yourls (Composer)

Affected versions

< 1.7.4

Patched versions

1.7.4

Description

Impact

YOURLS through 1.7.3 is affected by a type juggling vulnerability in the API component that can result in login bypass.

Patches

https://github.com/YOURLS/YOURLS/releases/tag/1.7.4
YOURLS/YOURLS#2542

References

For more information

If you have any questions or comments about this advisory:

References

@ozh ozh published to YOURLS/YOURLS Sep 22, 2019
Published to the GitHub Advisory Database Sep 23, 2019
Reviewed Jun 16, 2020
Last updated Jun 8, 2026

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(93rd percentile)

Weaknesses

Access of Resource Using Incompatible Type ('Type Confusion')

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. Learn more on MITRE.

CVE ID

CVE-2019-14537

GHSA ID

GHSA-vf23-f26f-mjj9

Source code

Credits

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