{"id":"CVE-2026-55834","title":"Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to services","summary":"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/+pag…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-601"],"vendor":"pocket-id","product":"github.com/pocket-id/pocket-id/backend","affected":["github.com/pocket-id/pocket-id/backend >= 2.6.0, <= 2.8.0"],"patched":["github.com/pocket-id/pocket-id/backend 2.9.0"],"published":"2026-08-28","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:09:13.080","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55834","references":[{"url":"https://github.com/pocket-id/pocket-id/commit/8a7577497131229badb35cb4b3a4227b1300afff","label":"security-advisories@github.com"},{"url":"https://github.com/pocket-id/pocket-id/releases/tag/v2.9.0","label":"security-advisories@github.com"},{"url":"https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv","label":"security-advisories@github.com"},{"url":"https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-2wvm-8mvp-22qv"}],"tags":["nvd","ghsa","go"],"epss":0.00269,"epssPercentile":0.19285,"aliases":["GHSA-2wvm-8mvp-22qv"],"ecosystem":"go","ingestedAt":"2026-08-28T17:22:56.945Z","slug":"CVE-2026-55834","body":"## Overview\n\nPocket 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55834)\n\nAffected packages:\n\n- `github.com/pocket-id/pocket-id/backend >= 2.6.0, <= 2.8.0`\n\nPatched in:\n\n- `github.com/pocket-id/pocket-id/backend 2.9.0`\n\nSource: https://github.com/advisories/GHSA-2wvm-8mvp-22qv","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}