Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass_CVE-2026-45278

{
    "lastseen": "",
    "description": "Nextcloud is an open source content collaboration platform. From version 6.1.0 to before version 8.2.2, an attacker can craft links that would redirect users to another website, when the victim uses the attackers link to log in via user OIDC. This issue has been patched in version 8.2.2.",
    "published": "2026-06-01T16:51:55.339Z",
    "modified": "2026-06-01T16:51:55.339Z",
    "type": "cve",
    "title": "Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass",
    "source": "GitHub_M",
    "references": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8wjr-5cg8-4w73\nhttps://github.com/nextcloud/user_oidc/pull/1273\nhttps://hackerone.com/reports/3464925",
    "id": "CVE-2026-45278",
    "bulletinFamily": "",
    "cwe": [
        "CWE-601"
    ],
    "cvelist": null,
    "sourceData": "nextcloud security-advisories >= 6.1.0, < 8.2.2",
    "sourceHref": "",
    "cvss": {
        "score": 3.3,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "security-advisories",
    "version": ">= 6.1.0, < 8.2.2",
    "vendor": "nextcloud",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}