{"cve":"CVE-2026-55834","nvd":{"published":"2026-08-28T20:18:30.030","modified":"2026-09-09T21:09:13.080","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-601"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55834","score":0.00373,"percentile":0.3132,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2wvm-8mvp-22qv","url":"https://osv.dev/vulnerability/GHSA-2wvm-8mvp-22qv","summary":"Pocket-ID has an Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none","modified":"2026-09-02T19:55:44.720187499Z","packages":[{"ecosystem":"Go","name":"github.com/pocket-id/pocket-id/backend","purl":"pkg:golang/github.com/pocket-id/pocket-id/backend","ranges":[">=2.6.0 <2.9.0"],"fixed":["2.9.0"]}]},{"id":"GO-2026-6305","url":"https://osv.dev/vulnerability/GO-2026-6305","summary":"Pocket-ID has an Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none in github.com/pocket-id/pocket-id/backend","modified":"2026-09-02T19:45:13.275380710Z","packages":[{"ecosystem":"Go","name":"github.com/pocket-id/pocket-id/backend","purl":"pkg:golang/github.com/pocket-id/pocket-id/backend","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}