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CVE-2026-123803

8.1 highEPSS 0.5%

High (8.1) in supertokens supertokens-core. EPSS 0.5% estimated probability of exploitation activity in the next 30 days.

On this page
SuperTokens Core is an open source authentication server. From 10.1.0 until 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, loadOptionsById_Transaction and getUserInfoByCredentialId_Transaction perform application-scoped WebAuthn lookups without constraining them to the requested tenant, and WebAuthN.signIn does not verify tenant membership. In a multi-tenant deployment using WebAuthn with a shared user pool, an ordinary user who possesses their own valid passkey in one tenant can submit its assertion to another tenant's sign-in endpoint in the same application and be authenticated there despite having no membership in the target tenant. This issue is fixed in versions 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.

Severity

CVSS 3.1

8.1 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
0.5% estimated probability of exploitation activity in the next 30 days; 42nd percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-09. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWEs
CWE-863 Incorrect Authorization
CWE-1220 Insufficient Granularity of Access Control
OWASP Top 10
A01:2025 Broken Access Control
Published
Assigned by
GitHub_M (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
supertokens-core>= 10.1.0, < 11.0.0
supertokens-core>= 11.0.0, < 11.0.9
supertokens-core>= 11.1.0, < 11.1.4
supertokens-core>= 11.2.0, < 11.2.4
supertokens-core>= 11.3.0, < 11.3.8
supertokens-core>= 11.4.0, < 11.4.8
supertokens-core>= 12.0.0, < 12.0.11
supertokens-core>= 12.1.0, < 12.1.2
supertokens-core>= 12.2.0, < 12.2.1
supertokens-core>= 12.3.0, < 12.3.1

Attack patterns (CAPEC)

  • CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs Likelihood: High · Severity: High
  • CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels Likelihood: High · Severity: Medium

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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