{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-33397",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-03-19T17:02:34.169Z",
        "datePublished": "2026-03-26T13:46:16.145Z",
        "dateUpdated": "2026-03-30T14:56:05.822Z"
    },
    "containers": {
        "cna": {
            "title": "Angular SSR Vulnerable to Protocol-Relative URL Injection via Single Backslash Bypass",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-601",
                            "lang": "en",
                            "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6.9,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/angular/angular-cli/security/advisories/GHSA-vfx2-hv2g-xj5f",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/angular/angular-cli/security/advisories/GHSA-vfx2-hv2g-xj5f"
                },
                {
                    "name": "https://github.com/angular/angular-cli/pull/32771",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/angular/angular-cli/pull/32771"
                },
                {
                    "name": "https://github.com/advisories/GHSA-xh43-g2fq-wjrj",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/advisories/GHSA-xh43-g2fq-wjrj"
                }
            ],
            "affected": [
                {
                    "vendor": "angular",
                    "product": "angular-cli",
                    "versions": [
                        {
                            "version": ">= 22.0.0-next.0, < 22.0.0-next.2",
                            "status": "affected"
                        },
                        {
                            "version": ">= 21.0.0-next.0, < 21.2.3",
                            "status": "affected"
                        },
                        {
                            "version": ">= 20.0.0-next.0, < 20.3.21",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-03-26T13:46:16.145Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "The Angular SSR is a server-rise rendering tool for Angular applications. Versions on the 22.x branch prior to 22.0.0-next.2, the 21.x branch prior to 21.2.3, and the 20.x branch prior to 20.3.21 have an Open Redirect vulnerability in `@angular/ssr` due to an incomplete fix for CVE-2026-27738. While the original fix successfully blocked multiple leading slashes (e.g., `///`), the internal validation logic fails to account for a single backslash (`\\`) bypass. When an Angular SSR application is deployed behind a proxy that passes the `X-Forwarded-Prefix` header, an attacker provides a value starting with a single backslash, the internal validation failed to flag the single backslash as invalid, the application prepends a leading forward slash, resulting in a `Location` header containing the URL, and modern browsers interpret the `/\\` sequence as `//`, treating it as a protocol-relative URL and redirecting the user to the attacker-controlled domain. Furthermore, the response lacks the `Vary: X-Forwarded-Prefix` header, allowing the malicious redirect to be stored in intermediate caches (Web Cache Poisoning). Versions 22.0.0-next.2, 21.2.3, and 20.3.21 contain a patch. Until the patch is applied, developers should sanitize the `X-Forwarded-Prefix` header in their `server.ts` before the Angular engine processes the request."
                }
            ],
            "source": {
                "advisory": "GHSA-vfx2-hv2g-xj5f",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-30T13:54:22.310595Z",
                                "id": "CVE-2026-33397",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-30T14:56:05.822Z"
                }
            }
        ]
    }
}