Security readout for executives and security teams
Plain-English summary
A PHP OAuth server library could accidentally expose cryptographic key material inside an exception message. This affects league/oauth2-server versions 8.3.2 through before 8.5.3 when keys are passed as strings and an invalid required pass phrase is provided.
Executive priority
Prioritize remediation for any OAuth authorization service using the affected library pattern. The business risk is sensitive key disclosure, which may require credential rotation if historical logs or error outputs exposed the key.
Technical view
CVE-2023-37260 is a CWE-209 information disclosure in the CryptKey constructor. In affected versions, a LogicException could include the provided key string when pass phrase validation failed. The vendor patched this in 8.5.3 so the key is no longer exposed in that exception path.
Likely exposure
Exposure is most likely in PHP applications using league/oauth2-server >=8.3.2 and <8.5.3, passing key material directly as strings to CryptKey, and surfacing exception messages through logs, error responses, monitoring, or support bundles.
Exploitation context
The source bundle does not show known active exploitation, and KEV is false. Risk depends on whether an attacker or unauthorized party can view the exception message. If exposed, the leaked key material could weaken the OAuth server’s trust boundary.
Researcher notes
Evidence is specific to one failure path: invalid required pass phrase plus key passed as a string. The advisory names upgrade 8.5.3 and file-based key passing as the workaround. No source in the bundle confirms weaponized exploitation.
Mitigation direction
- Upgrade league/oauth2-server to version 8.5.3 or later.
- Pass keys as files instead of strings when using CryptKey.
- Review vendor advisory and release notes before deployment.
- Limit exposure of exception details in user-facing responses and shared logs.
Validation and detection
- Inventory applications using league/oauth2-server.
- Confirm installed versions are not >=8.3.2 and <8.5.3.
- Check whether CryptKey receives key strings rather than file paths.
- Review error logs for exposed key material from LogicException messages.
- Verify production error handling does not disclose exception details publicly.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-209: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-37260 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N3.94.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/thephpleague/oauth2-server/security/advisories/GHSA-wj7q-gjg8-3cpmCVE reference · x_refsource_CONFIRM
- https://github.com/thephpleague/oauth2-server/pull/1353CVE reference · x_refsource_MISC
- https://github.com/thephpleague/oauth2-server/releases/tag/8.5.3CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Generation of Error Message Containing Sensitive Information
Generation of Error Message Containing Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.