GHSA-fm3f-ch8h-qw8qPublished

@hono/oauth-providers: OAuth state check fails open on omitted state, enabling login CSRF and forced account linking

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cve-program · CVE-2026-81888

Published

@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.

Source published: 31 Aug 2026 20:27:33 UTC
Source modified: 1 Sep 2026 14:59:01 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
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CVSS 3.1 · 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

euvd · EUVD-2026-68770

Published

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datePublished: Aug 31, 2026, 8:27:33 PM

dateUpdated: Sep 1, 2026, 2:59:01 PM

Source published: Aug 31, 2026, 8:27:33 PM (timezone not stated)
Source modified: Sep 1, 2026, 2:59:01 PM (timezone not stated)
Saved here: 11 Nov 2026 16:10:34 UTC
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EUVD CVSS 3.1 · 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

nvd · CVE-2026-81888

Published

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Source analysis status: Deferred

Weakness classifications: CWE-352 · CWE-1275

Original publisher date fields

published: 2026-08-31T21:17:52.317

lastModified: 2026-09-09T21:09:13.080

Source published: 31 Aug 2026 21:17:52 UTC
Source modified: 9 Sep 2026 21:09:13 UTC
Saved here: 25 Oct 2026 16:19:10 UTC
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CVSS 3.1 · [email protected] · Secondary · 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

osv · GHSA-fm3f-ch8h-qw8q

Published

### Summary 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. ### Details The `state` check treated two absent values as a match, so a callback that omits `state` — and for which no `state` was ever stored — was allowed to redeem the authorization code. Hono's `csrf()` middleware does not help: it only inspects form-style requests, while the OAuth callback is a top-level `GET` navigation it treats as safe. This affects the `google`, `github`, `facebook`, `discord`, `twitch`, `linkedin`, and `msentra` providers. The `x` (Twitter) provider is not exploitable due to its PKCE binding. ### Impact An attacker can make a victim's browser complete an OAuth callback that binds the attacker's identity instead of the victim's, leading to login CSRF (the victim silently acts inside the attacker's account) or forced account linking (the attacker's identity is linked to the victim's account, enabling later sign-in as the victim). Affects applications using an affected provider on `@hono/oauth-providers` `0.8.5` or earlier.

Source published: 31 Aug 2026 20:30:50 UTC
Source modified: 15 Sep 2026 05:30:05 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Publisher rating · MODERATE