CVE-2023-37260: league/oauth2-server key exposed in exception message when passing as string and providing invalid pass phrase

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-06 · updated 2026-06-17
Weakness: CWE-209

Description

league/oauth2-server is an implementation of an OAuth 2.0 authorization server written in PHP. Starting in version 8.3.2 and prior to version 8.5.3, servers that passed their keys to the CryptKey constructor as as string instead of a file path will have had that key included in a LogicException message if they did not provide a valid pass phrase for the key where required. This issue has been patched so that the provided key is no longer exposed in the exception message in the scenario outlined above. Users should upgrade to version 8.5.3 to receive the patch. As a workaround, pass the key as a file instead of a string.

Affected products

thephpleague oauth2-server: from 8.3.2 before 8.5.3 — fixed in 8.5.3

How to fix

Upgrade to a fixed version: thephpleague oauth2-server 8.5.3. Check the vendor advisory for mitigations.

References

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