CVE-2026-55834

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{"affected": [{"affectedData": [{"product": "pocket-id", "vendor": "pocket-id", "versions": [{"status": "affected", "version": ">= 2.6.0, < 2.9.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-55834", "lastModified": "2026-09-09T21:09:13.080", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55834", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-28T20:27:55.433241Z", "version": "2.0.3"}}]}, "published": "2026-08-28T20:18:30.030", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pocket-id/pocket-id/commit/8a7577497131229badb35cb4b3a4227b1300afff"}, {"source": "security-advisories@github.com", "url": "https://github.com/pocket-id/pocket-id/releases/tag/v2.9.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-2wvm-8mvp-22qv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.6.0,2.9.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pocket-id", "source": "cna", "vendor": "pocket-id"}, "product": "pocket-id", "vendor": "pocket-id"}], "created": "2026-08-28T21:30:05.387631+00:00", "updated": "2026-08-28T22:30:17.389820+00:00", "vendors": ["pocket-id", "pocket-id$PRODUCT$pocket-id"]}