Vulnerability-Lookup

CVE-2026-111754 (GCVE-0-2026-111754)

Vulnerability from cvelistv5 – Published: 2026-11-03 20:55 – Updated: 2026-11-03 21:23

Title

Angular: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)

Summary

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.33, 21.2.25, and 22.2.1, ServerPlatformLocation in Angular server-side rendering checks for protocol-relative URLs before WHATWG URL normalization. A request path containing a popping dot segment followed by multiple slashes can bypass the raw resolveUrl check and normalize to a pathname beginning with two slashes. When Angular SSR detects a mismatch with the router's final location, it can place that pathname in an HTTP Location header, causing a browser to navigate to an attacker-controlled origin. Affected applications use @angular/platform-server and @angular/ssr and either expose compatible parameter or child route shapes or pass user-controlled navigation targets through infrastructure that preserves the relevant dot segments or semicolons. Pure client-side SPAs are not affected. This issue is fixed in versions 20.3.33, 21.2.25, and 22.2.1.

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-03 21:23 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7913 records in the last 180 days details

References

11 references

URL	Tags
https://github.com/angular/angular/security/advis…	x_refsource_CONFIRM
https://github.com/angular/angular/issues/71076	x_refsource_MISC
https://github.com/angular/angular/pull/71077	x_refsource_MISC
https://github.com/angular/angular/pull/71078	x_refsource_MISC
https://github.com/angular/angular/pull/71079	x_refsource_MISC
https://github.com/angular/angular/commit/450af9c…	x_refsource_MISC
https://github.com/angular/angular/commit/83944fc…	x_refsource_MISC
https://github.com/angular/angular/commit/928dcfd…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v…	x_refsource_MISC
https://github.com/angular/angular/releases/tag/v22.2.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
angular	angular	Affected: <= 19.2.25 Affected: >= 20.0.0, < 20.3.33 Affected: >= 21.0.0, < 21.2.25 Affected: >= 22.0.0, < 22.2.1	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-111754",
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        "discovery": "UNKNOWN"
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      "title": "Angular: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)"
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}

FKIE_CVE-2026-111754

Vulnerability from fkie_nvd - Published: 2026-11-03 21:16 - Updated: 2026-11-03 22:17

Severity

5.1 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/angular/angular/commit/450af9c813c7660b9bd91e5635f705ee3ed7b32a
	security-advisories@github.com	https://github.com/angular/angular/commit/83944fc8c50e86be90e8ec4184cd15002b5af262
	security-advisories@github.com	https://github.com/angular/angular/commit/928dcfd2582152655b5559509d057bf6a5a19521
	security-advisories@github.com	https://github.com/angular/angular/issues/71076
	security-advisories@github.com	https://github.com/angular/angular/pull/71077
	security-advisories@github.com	https://github.com/angular/angular/pull/71078
	security-advisories@github.com	https://github.com/angular/angular/pull/71079
	security-advisories@github.com	https://github.com/angular/angular/releases/tag/v20.3.33
	security-advisories@github.com	https://github.com/angular/angular/releases/tag/v21.2.25
	security-advisories@github.com	https://github.com/angular/angular/releases/tag/v22.2.1
	security-advisories@github.com	https://github.com/angular/angular/security/advisories/GHSA-w739-gvwx-grc3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "product": "angular",
          "vendor": "angular",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 19.2.25"
            },
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            },
            {
              "status": "affected",
              "version": "\u003e= 21.0.0, \u003c 21.2.25"
            },
            {
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              "version": "\u003e= 22.0.0, \u003c 22.2.1"
            }
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      "url": "https://github.com/angular/angular/pull/71077"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/pull/71078"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/pull/71079"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/releases/tag/v20.3.33"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/releases/tag/v21.2.25"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/releases/tag/v22.2.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-w739-gvwx-grc3"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-W739-GVWX-GRC3

Vulnerability from github – Published: 2026-10-20 14:35 – Updated: 2026-10-20 14:35

Summary

@angular/platform-server: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)

Details

An open redirect vulnerability was identified in @angular/platform-server when Server-Side Rendering (SSR) is enabled.

When Angular SSR renders an incoming request, URL resolution and platform navigation are managed by ServerPlatformLocation using resolveUrl (or parseUrl in v20). While resolveUrl rejected protocol-relative URLs whose raw string directly started with //, this check ran prior to WHATWG URL normalization.

When a request URL includes a popping dot-segment followed by multiple slashes (such as /.//evil.test or serialized from router route shapes like /.;/(//evil.test)), the input bypassed the initial urlStr.startsWith('//') check. Subsequent WHATWG URL parsing resolved the dot-segments and resulted in a pathname starting with // (//evil.test).

Consequently, ServerPlatformLocation stored pathname = '//evil.test'. When @angular/ssr detected a mismatch between the rendered URL and the router's final location state, it emitted the unnormalized pathname into the HTTP Location response header, producing an HTTP 302 redirect with Location: //evil.test, which browsers resolve as a protocol-relative navigation off-origin.

Impact

Successful exploitation allows an unauthenticated remote attacker to craft URLs that trick Angular SSR into redirecting users to an arbitrary external domain.

Bypasses Application-Level Guards: Common application-level validation routines (such as checking !returnUrl.startsWith('//') before invoking router.navigateByUrl) accept /.//evil.test or /.;/(//evil.test) as a safe relative path, allowing attackers to bypass redirect allowlists.
Client-side SPAs Unaffected: Pure client-side Angular applications (Single Page Applications without SSR) are not vulnerable, as ServerPlatformLocation is only utilized in server-side execution environments.

Attack Preconditions & Vulnerable Configurations

An application is affected if the following conditions are met:

SSR Enabled: The application runs in a Server-Side Rendering environment using @angular/platform-server and @angular/ssr.
Parameter Route Shapes: The router contains parameter routes with wildcard or child segments (e.g. /:tenant matching . and serializing secondary outlet groups (//evil.test) to /.//evil.test), or passes user-provided navigation targets (e.g. returnUrl).
Reverse Proxy Passthrough: Upstream reverse proxies (Nginx, Cloudflare, ALB) pass semicolons (;) or dot-segments without stripping or normalizing them.

Exploit Payload Example

An attacker sends a request targeting a route with parameters and child segments:

GET /.;/(//evil.test) HTTP/1.1
Host: example.com

Response:

HTTP/1.1 302 Found
Location: //evil.test

The client browser resolves //evil.test protocol-relatively and redirects the user away from example.com to evil.test.

Patches

The issue is resolved by updating resolveUrl (and parseUrl in v20) in @angular/platform-server to verify that the normalized URL pathname does not start with // when allowProtocolRelative is false.

22.2.1
21.2.25
20.3.33

Workarounds & Mitigations

If you cannot immediately upgrade to a patched version, apply one of the following mitigations at your edge reverse proxy or WAF:

Reject Paths with Dot-Segments Followed by Slashes: Configure your reverse proxy (e.g., Nginx, Cloudflare, AWS WAF) to block requests containing /.//, /..//, or /.;/: nginx # Nginx example: reject suspicious path normalization sequences if ($request_uri ~* "(\n/\.\/|\/\.\;)") { return 400; }
Sanitize Redirect Headers: Ensure edge proxies or API gateways rewrite or disallow protocol-relative (//) Location response headers originating from the SSR upstream.

Severity

5.1 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "22.0.0"
            },
            {
              "fixed": "22.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "21.0.0"
            },
            {
              "fixed": "21.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "20.0.0"
            },
            {
              "fixed": "20.3.33"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@angular/platform-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "19.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-111754"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-20T14:35:49Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "An open redirect vulnerability was identified in `@angular/platform-server` when Server-Side Rendering (SSR) is enabled.\n\nWhen Angular SSR renders an incoming request, URL resolution and platform navigation are managed by `ServerPlatformLocation` using `resolveUrl` (or `parseUrl` in v20). While `resolveUrl` rejected protocol-relative URLs whose raw string directly started with `//`, this check ran *prior* to WHATWG URL normalization.\n\nWhen a request URL includes a popping dot-segment followed by multiple slashes (such as `/.//evil.test` or serialized from router route shapes like `/.;/(//evil.test)`), the input bypassed the initial `urlStr.startsWith(\u0027//\u0027)` check. Subsequent WHATWG URL parsing resolved the dot-segments and resulted in a `pathname` starting with `//` (`//evil.test`).\n\nConsequently, `ServerPlatformLocation` stored `pathname = \u0027//evil.test\u0027`. When `@angular/ssr` detected a mismatch between the rendered URL and the router\u0027s final location state, it emitted the unnormalized pathname into the HTTP `Location` response header, producing an HTTP 302 redirect with `Location: //evil.test`, which browsers resolve as a protocol-relative navigation off-origin.\n\n### Impact\n\nSuccessful exploitation allows an unauthenticated remote attacker to craft URLs that trick Angular SSR into redirecting users to an arbitrary external domain.\n\n* **Bypasses Application-Level Guards:** Common application-level validation routines (such as checking `!returnUrl.startsWith(\u0027//\u0027)` before invoking `router.navigateByUrl`) accept `/.//evil.test` or `/.;/(//evil.test)` as a safe relative path, allowing attackers to bypass redirect allowlists.\n* **Client-side SPAs Unaffected:** Pure client-side Angular applications (Single Page Applications without SSR) are **not** vulnerable, as `ServerPlatformLocation` is only utilized in server-side execution environments.\n\n### Attack Preconditions \u0026 Vulnerable Configurations\n\nAn application is affected if the following conditions are met:\n\n* **SSR Enabled:** The application runs in a Server-Side Rendering environment using `@angular/platform-server` and `@angular/ssr`.\n* **Parameter Route Shapes:** The router contains parameter routes with wildcard or child segments (e.g. `/:tenant` matching `.` and serializing secondary outlet groups `(//evil.test)` to `/.//evil.test`), or passes user-provided navigation targets (e.g. `returnUrl`).\n* **Reverse Proxy Passthrough:** Upstream reverse proxies (Nginx, Cloudflare, ALB) pass semicolons (`;`) or dot-segments without stripping or normalizing them.\n\n#### Exploit Payload Example\n\nAn attacker sends a request targeting a route with parameters and child segments:\n\n```http\nGET /.;/(//evil.test) HTTP/1.1\nHost: example.com\n```\n\n**Response:**\n```http\nHTTP/1.1 302 Found\nLocation: //evil.test\n```\n\nThe client browser resolves `//evil.test` protocol-relatively and redirects the user away from `example.com` to `evil.test`.\n\n### Patches\n\nThe issue is resolved by updating `resolveUrl` (and `parseUrl` in v20) in `@angular/platform-server` to verify that the normalized URL pathname does not start with `//` when `allowProtocolRelative` is `false`.\n\n* `22.2.1`\n* `21.2.25`\n* `20.3.33`\n\n### Workarounds \u0026 Mitigations\n\nIf you cannot immediately upgrade to a patched version, apply one of the following mitigations at your edge reverse proxy or WAF:\n\n1. **Reject Paths with Dot-Segments Followed by Slashes:**\n   Configure your reverse proxy (e.g., Nginx, Cloudflare, AWS WAF) to block requests containing `/.//`, `/..//`, or `/.;/`:\n   ```nginx\n   # Nginx example: reject suspicious path normalization sequences\n   if ($request_uri ~* \"(\\n/\\.\\/|\\/\\.\\;)\") {\n       return 400;\n   }\n   ```\n2. **Sanitize Redirect Headers:**\n   Ensure edge proxies or API gateways rewrite or disallow protocol-relative (`//`) `Location` response headers originating from the SSR upstream.",
  "id": "GHSA-w739-gvwx-grc3",
  "modified": "2026-10-20T14:35:49Z",
  "published": "2026-10-20T14:35:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/security/advisories/GHSA-w739-gvwx-grc3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/pull/71077"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/pull/71078"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/pull/71079"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/450af9c813c7660b9bd91e5635f705ee3ed7b32a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/83944fc8c50e86be90e8ec4184cd15002b5af262"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/928dcfd2582152655b5559509d057bf6a5a19521"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/commit/d7d81e189d227108c3b9d39178dbb7389f6f970d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/angular/angular"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v20.3.33"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v21.2.25"
    },
    {
      "type": "WEB",
      "url": "https://github.com/angular/angular/releases/tag/v22.2.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@angular/platform-server: Open Redirect via Protocol-Relative URLs in Server-Side Rendering (SSR)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-111754 (GCVE-0-2026-111754)

FKIE_CVE-2026-111754

GHSA-W739-GVWX-GRC3

Impact

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Exploit Payload Example

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