CVE-2023-50708

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 50% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

December 22, 2023

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implementation of yii2-authclient · Advisory · yiisoft/yii2-authclient · GitHub

https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-w8vh-p74j-x9xp
github_commit

commit dabddf2154ab (yiisoft/yii2-authclient)

Fix landed in yiisoft/yii2-authclient commit dabddf2154ab — awaiting tagged release

https://github.com/yiisoft/yii2-authclient/commit/dabddf2154ab7e7703740205a069202554089248
generic

yii2-authclient/src/OpenIdConnect.php at 0d1c3880f4d79e20aa1d77c012650b54e69695ff · yiisoft/yii2-authclient · GitHub

https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420
generic

yii2-authclient/src/OAuth2.php at 0d1c3880f4d79e20aa1d77c012650b54e69695ff · yiisoft/yii2-authclient · GitHub

https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121
generic

yii2-authclient/src/OAuth1.php at 0d1c3880f4d79e20aa1d77c012650b54e69695ff · yiisoft/yii2-authclient · GitHub

https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
yiisoft/yii2-authclient2.0.0 ... 2.2.9 (33 versions)2.2.15—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 171 total refreshes for this CVE.

  1. 2026-09-18 19:26 UTCEPSS rescore
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  44. 2026-07-22 23:15 UTCEG score recompute▲ 3.70
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-50708?
CVE-2023-50708 is a critical vulnerability published on December 22, 2023. 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…
When was CVE-2023-50708 disclosed?
CVE-2023-50708 was first published in the National Vulnerability Database on December 22, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-50708 actively exploited?
CVE-2023-50708 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.7% of all scored CVEs.
What is the CVSS score of CVE-2023-50708?
CVE-2023-50708 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-50708?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-50708, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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