CVE-2026-81888 (GCVE-0-2026-81888)

Vulnerability from cvelistv5 – Published: 2026-08-31 20:27 – Updated: 2026-09-01 14:59
VLAI
Title
@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking
Summary
@hono/oauth-providers is Authentication middleware for Hono. Prior to version 0.8.6, the built-in social login providers accept an OAuth callback even when the `state` value is absent on both sides, so the anti-CSRF check passes for a callback that never came from a genuine login attempt. This defeats the `state`-based CSRF protection under default usage. Version 0.8.6 has a patch.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 14:15 UTC
CWE
  • CWE-352 - Cross-Site Request Forgery (CSRF)
  • CWE-1275 - Sensitive Cookie with Improper SameSite Attribute
Assigner
References
Impacted products
Vendor Product Version CPE status
honojs @hono/oauth-providers Affected: < 0.8.6
guessed Create a notification for this product.
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.