# CVE-2026-55834

## Summary

- **CVE ID:** CVE-2026-55834
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
- **CWE:** CWE-601
- **Published:** Aug 28, 2026
- **Last Modified:** Aug 28, 2026

## 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 — pocket-id (>= 2.6.0, < 2.9.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 18.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._