CVE-2023-50708

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7% (54th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2023-3310 (ENISA EUVD) · GHSA-w8vh-p74j-x9xp (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
54th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 22, 2023

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Nov 1, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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
Web page

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

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

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

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

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

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

Vendor Advisories for CVE-2023-50708(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composeryiisoft/yii2-authclient @ 2.2.15 (fixes <= 2.2.14)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
yiisoft/yii2-authclient2.0.0 ... 2.2.9 (33 versions)
  • every version up to 2.2.15: fixed in 2.2.15
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 267 rows on record for this CVE, as 98 entries (2 repeats merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 167 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 03:38 UTCEchelonGraph re-scored
  2. 2026-11-13 03:38 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  3. 2026-11-12 16:30 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  4. 2026-11-12 05:15 UTCEchelonGraph re-scored
  5. 2026-11-12 05:15 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  6. 2026-11-11 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  7. 2026-11-11 06:53 UTCEchelonGraph re-scored
  8. 2026-11-11 06:53 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  9. 2026-11-10 16:37 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  10. 2026-11-10 08:30 UTCEchelonGraph re-scored
  11. 2026-11-10 08:30 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  12. 2026-11-09 16:30 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  13. 2026-11-09 10:07 UTCEchelonGraph re-scored
  14. 2026-11-09 10:07 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  15. 2026-11-08 16:35 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  16. 2026-11-08 11:42 UTCEchelonGraph re-scored
  17. 2026-11-08 11:42 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  18. 2026-11-07 16:35 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  19. 2026-11-07 13:19 UTCEchelonGraph re-scored
  20. 2026-11-07 13:19 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  21. 2026-11-06 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  22. 2026-11-06 14:57 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  23. 2026-11-05 16:35 UTCEchelonGraph re-scored
  24. 2026-11-05 16:35 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  25. 2026-11-05 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
Show 73 more
  1. 2026-11-04 18:25 UTCOSV refresh
  2. 2026-11-04 18:11 UTCEchelonGraph re-scored
  3. 2026-11-04 18:11 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  4. 2026-11-04 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-11-03 19:48 UTCEchelonGraph re-scored
  6. 2026-11-03 19:48 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  7. 2026-11-03 16:41 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-11-02 21:25 UTCEchelonGraph re-scored
  9. 2026-11-02 21:25 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  10. 2026-11-02 16:40 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-11-01 23:03 UTCEchelonGraph re-scored
  12. 2026-11-01 23:02 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  13. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-11-01 08:17 UTCGHSA enrichmentGHSA-w8vh-p74j-x9xp · GitHub severity LOW
  15. 2026-11-01 00:40 UTCEchelonGraph re-scored
  16. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  17. 2026-10-31 02:17 UTCEchelonGraph re-scored
  18. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  19. 2026-10-30 03:55 UTCEchelonGraph re-scored
  20. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  21. 2026-10-29 05:32 UTCEchelonGraph re-scored
  22. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  23. 2026-10-28 07:10 UTCEchelonGraph re-scored
  24. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  25. 2026-10-27 08:47 UTCEchelonGraph re-scored
  26. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  27. 2026-10-25 17:30 UTCEchelonGraph re-scored
  28. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  29. 2026-10-25 10:15 UTCEchelonGraph re-scored
  30. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  31. 2026-10-24 11:53 UTCEchelonGraph re-scored
  32. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  33. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  34. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  35. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  36. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  37. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  38. 2026-10-18 07:44 UTCEchelonGraph re-scored
  39. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  40. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  41. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  42. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  43. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  44. 2026-10-12 18:14 UTCEchelonGraph re-scored
  45. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  46. 2026-10-12 09:24 UTCOSV refresh
  47. 2026-10-11 21:40 UTCEchelonGraph re-scored
  48. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  49. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  50. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  51. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  52. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  53. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  54. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  55. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  56. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  57. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  58. 2026-09-30 16:35 UTCEchelonGraph re-scored
  59. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  60. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  61. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  62. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  63. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  64. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  65. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  66. 2026-09-22 14:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  67. 2026-09-22 12:45 UTCOSV refresh
  68. 2026-09-21 20:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  69. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  70. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  71. 2026-09-17 19:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  72. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  73. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile

Frequently asked(5)

What is CVE-2023-50708?
CVE-2023-50708 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2023-50708 published?
The CVE record for CVE-2023-50708 was published on December 22, 2023. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2023-50708 actively exploited?
CVE-2023-50708 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (54th percentile of EPSS-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?
A fix for CVE-2023-50708 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-50708 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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