What’s Vulnerable › Vulnerabilities

CVE-2026-55834: Pocket ID: Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-09-09
• Weakness: CWE-601

Description

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to services. From 2.6.0 until 2.9.0, frontend/src/routes/authorize/+page.ts reads the redirect_uri query parameter and frontend/src/routes/authorize/+page.svelte uses the raw callbackURL in redirectWithError when prompt=none cannot complete silent authorization. The client-side path only blocks javascript and data schemes and does not invoke the backend callback allow-list validation, so an unauthenticated attacker who knows a valid client_id can redirect a victim browser to an arbitrary HTTP or HTTPS origin for phishing or OIDC error and state smuggling. This issue is fixed in version 2.9.0.

Affected products

• pocket-id: from 2.6.0, < 2.9.0

References

• https://github.com/pocket-id/pocket-id/commit/8a7577497131229badb35cb4b3a4227b1300afff
• https://github.com/pocket-id/pocket-id/releases/tag/v2.9.0
• https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv
• https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv

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