CVEvulnerability

CVE-2023-50714

8.8 HIGH Published 2023-12-22 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-12-22
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-287, CWE-347, CWE-918

Description

yii2-authclient is an extension that adds OpenID, OAuth, OAuth2 and OpenId Connect consumers for the Yii framework 2.0. In yii2-authclient prior to version 2.2.15, the Oauth2 PKCE implementation is vulnerable in 2 ways. First, the `authCodeVerifier` should be removed after usage (similar to `authState`). Second, there is a risk for a `downgrade attack` if PKCE is being relied on for CSRF protection. Version 2.2.15 contains a patch for the issue. No known workarounds are available.

Affected configurations

• yiiframework yii2-authclient (< 2.2.15)

Related

Weakness · CWE (3)

  • CWE-287 Improper Authentication weakness
  • CWE-347 Improper Verification of Cryptographic Signature weakness
  • CWE-918 Server-Side Request Forgery weakness

References