OAuth2 Proxy: Session cookie not cleared when rendering sign-in page_CVE-2026-34454

{
    "lastseen": "",
    "description": "OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the sign-in page as part of their logout flow, a user may be shown the sign-in page while the existing session cookie remains valid, meaning the browser session is not actually logged out. On shared workstations or devices, a subsequent user could continue to use the previous user's authenticated session. Deployments that use a dedicated logout/sign-out endpoint to terminate sessions are not affected. This issue is fixed in 7.15.2",
    "published": "2026-04-14T22:10:37.901Z",
    "modified": "2026-04-14T22:14:00.972Z",
    "type": "cve",
    "title": "OAuth2 Proxy: Session cookie not cleared when rendering sign-in page",
    "source": "GitHub_M",
    "references": "https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f\nhttps://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2",
    "id": "CVE-2026-34454",
    "bulletinFamily": "",
    "cwe": [
        "CWE-613",
        "CWE-384"
    ],
    "cvelist": null,
    "sourceData": "oauth2-proxy oauth2-proxy >= 7.11.0, < 7.15.2",
    "sourceHref": "",
    "cvss": {
        "score": 3.5,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/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": "oauth2-proxy",
    "version": ">= 7.11.0, < 7.15.2",
    "vendor": "oauth2-proxy",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}