Skip to content
Fencer Vulns
medium 6.1

CVE-2023-50708 json

yii2-authclient vulnerable to possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implementation

published 2023-12-18 2 y ago modified 2026-09-10 1 mo ago also GHSA-w8vh-p74j-x9xp , EUVD-2023-3310

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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 Oauth1/2 `state` and OpenID Connect `nonce` is vulnerable for a `timing attack` since it is compared via regular string comparison (instead of `Yii::$app->getSecurity()->compareString()`). Version 2.2.15 contains a patch for the issue. No known workarounds are available.

Patch / fix

  • packagist yiisoft/yii2-authclient 2.2.15
  • yiiframework yii2-authclient 2.2.15

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-w8vh-p74j-x9xp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 0.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist yiisoft/yii2-authclient
<2.2.15
2.2.15

Affected products

  • yiisoft yii2-authclient

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.