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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-20896",
        "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "state": "PUBLISHED",
        "assignerShortName": "Gitea",
        "dateReserved": "2026-03-03T03:25:59.988Z",
        "datePublished": "2026-07-03T20:19:29.588Z",
        "dateUpdated": "2026-07-07T17:00:46.549Z"
    },
    "containers": {
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            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "Gitea Open Source Git Server",
                    "vendor": "Gitea",
                    "versions": [
                        {
                            "lessThanOrEqual": "1.26.2",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Joshua Martinelle (Tenable)",
                    "type": "reporter"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "rz1027"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Gitea Docker image versions up to and including 1.26.2 use REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 9.8,
                        "baseSeverity": "CRITICAL",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-284",
                            "description": "CWE-284",
                            "lang": "en",
                            "type": "CWE"
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            ],
            "providerMetadata": {
                "orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
                "shortName": "Gitea",
                "dateUpdated": "2026-07-05T14:43:07.900Z"
            },
            "references": [
                {
                    "name": "GitHub Security Advisory",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4"
                },
                {
                    "name": "GitHub Pull Request #38151",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/go-gitea/gitea/pull/38151"
                },
                {
                    "name": "Gitea v1.26.3 Release",
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://github.com/go-gitea/gitea/releases/tag/v1.26.3"
                },
                {
                    "name": "Gitea v1.26.4 Release Blog Post",
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://blog.gitea.com/release-of-1.26.3-and-1.26.4/"
                }
            ],
            "title": "Gitea Docker image trusts spoofable reverse-proxy headers by default",
            "x_generator": {
                "engine": "cvelib 1.8.0"
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        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4",
                        "tags": [
                            "exploit"
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                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-06T19:03:07.590667Z",
                                "id": "CVE-2026-20896",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-07T17:00:46.549Z"
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}