CVE-2026-55834 json
Pocket ID: Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=none
published 2026-08-28 2 mo ago modified 2026-09-09 1 mo ago also GHSA-2wvm-8mvp-22qv , GO-2026-6305 , EUVD-2026-67828
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- public exploits
- 0
- none known
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/+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.
Patch / fix
- go github.com/pocket-id/pocket-id/backend 2.9.0
- govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260902T191204-160000.1.1
suse advisories SUSE-SU-2026:23692-1SUSE-SU-2026:23712-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260902T191204-160000.1.1
opensuse advisories openSUSE-SU-2026:21812-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/pocket-id/pocket-id/backend | >=2.6.0, <2.9.0 all versions |
2.9.0 |
Affected products
- pocket-id pocket-id
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
Sources
- CVE List CVE-2026-55834
- GitHub Advisory GHSA-2wvm-8mvp-22qv
- NVD CVE-2026-55834
- OSV GO-2026-6305
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.