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

Quick assessment

Affected
pocket-id pocket-id
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pocket ID 是一个 OIDC 提供商，允许用户使用其通行密钥（passkeys）向服务进行身份认证。在 2.6.0 至 2.9.0 版本中， 读取 查询参数，而 在 无法完成静默授权时，会在 中使用原始的 。客户端路径仅拦截 和 协议，且未调用后端的回调白名单校验，因此，一个知道有效 的未认证攻击者可以将受害者浏览器重定向到任意的 HTTP 或 HTTPS 源，从而实现网络钓鱼（phishing）或 OIDC 错误及状态（state）偷换（state smuggling）。该问题已在 2.9.0 版本中修复

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1566 · Phishing

Affected Version Matrix 1

VendorProduct Version RangeStatus
pocket-id pocket-id >= 2.6.0, < 2.9.0 affected
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I. Basic Information for CVE-2026-55834

Vulnerability Information
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Vulnerability Title
Pocket ID: Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pocket-id pocket-id >= 2.6.0, < 2.9.0 -

II. Public POCs for CVE-2026-55834

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III. Intelligence Information for CVE-2026-55834

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Patches & Fixes for CVE-2026-55834 (1)

Vendor Advisories for CVE-2026-55834 (1)

Vendor Pages for CVE-2026-55834 (1)

IV. Related Vulnerabilities

Same product: pocket-id
Same vendor: pocket-id
Same weakness: CWE-601

V. Comments for CVE-2026-55834

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