Victim redirection via unchecked OIDC callback URL
Published Aug 28, 2026 · Updated Aug 28, 2026
Open redirect in Pocket ID 2.6.0 through 2.8.0 allows remote attackers to redirect victim browsers via crafted OIDC authorization links. The prompt=none failure path reads redirect_uri in +page.ts, then +page.svelte assigns the raw HTTP or HTTPS callback URL to window.location.href without backend allow-list validation. A known client_id and victim interaction are required; the result is redirection to an attacker-controlled origin for phishing or OIDC error and state smuggling.
Summary
What happened
Open redirect in Pocket ID 2.6.0 through 2.8.0 allows remote attackers to redirect victim browsers via crafted OIDC authorization links. The prompt=none failure path reads redirect_uri in +page.ts, then +page.svelte assigns the raw HTTP or HTTPS callback URL to window.location.href without backend allow-list validation. A known client_id and victim interaction are required; the result is redirection to an attacker-controlled origin for phishing or OIDC error and state smuggling.
The record
- CVE
- CVE-2026-55834
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- Pocket ID
- Product
- Pocket ID
- Classifications
- CWE-601, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.6.0, < 2.9.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GitHub advisory browser redirect proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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