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TI-2025-38694 Aliases CVE-2025-62427GHSA-q63q-pgmf-mxhr

Server-Side Request Forgery (SSRF) in Angular SSR

Priority HIGH 71CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

The Angular SSR is a server-rise rendering tool for Angular applications. The vulnerability is a Server-Side Request Forgery (SSRF) flaw within the URL resolution mechanism of Angular's Server-Side Rendering package (@angular/ssr) before 19.2.18, 20.3.6, and 21.0.0-next.8. The function createRequestUrl uses the native URL constructor. When an incoming request path (e.g., originalUrl or url) begins with a double forward slash (//) or backslash (\\), the URL constructor treats it as a schema-relative URL. This behavior overrides the security-intended base URL (protocol, host, and port) supplied as the second argument, instead resolving the URL against the scheme of the base URL but adopting the attacker-controlled hostname. This allows an attacker to specify an external domain in the URL path, tricking the Angular SSR environment into setting the page's virtual location (accessible via DOCUMENT or PlatformLocation tokens) to this attacker-controlled domain. Any subsequent relative HTTP requests made during the SSR process (e.g., using HttpClient.get('assets/data.json')) will be incorrectly resolved against the attacker's domain, forcing the server to communicate with an arbitrary external endpoint. This vulnerability is fixed in 19.2.18, 20.3.6, and 21.0.0-next.8.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00432 37th percentileScored 2026-11-07
Fix Fixed angular-cli (angular): 19.2.18, 20.3.6, 21.0.0-next.8@angular/ssr (npm): 19.2.18, 20.3.6, 21.0.0-next.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
angularangular-cli19.0.0-next.0 to before 19.2.18; 20.0.0-next.0 to before 20.3.6; 21.0.0-next.0 to before 21.0.0-next.819.2.18, 20.3.6, 21.0.0-next.8Patch availableCNA
—@angular/ssr (npm)19.0.0-next.0 to before 19.2.1819.2.18Patch availableGHSA-q63q-pgmf-mxhr
—@angular/ssr (npm)20.0.0-next.0 to before 20.3.620.3.6Patch availableGHSA-q63q-pgmf-mxhr
—@angular/ssr (npm)21.0.0-next.0 to before 21.0.0-next.821.0.0-next.8Patch availableGHSA-q63q-pgmf-mxhr
  • angular-cli Vendorangular Affected 19.0.0-next.0 to before 19.2.18; 20.0.0-next.0 to before 20.3.6; 21.0.0-next.0 to before 21.0.0-next.8 Fixed in 19.2.18, 20.3.6, 21.0.0-next.8 Patch available CNA
  • @angular/ssr (npm) Vendor— Affected 19.0.0-next.0 to before 19.2.18 Fixed in 19.2.18 Patch available GHSA-q63q-pgmf-mxhr
  • @angular/ssr (npm) Vendor— Affected 20.0.0-next.0 to before 20.3.6 Fixed in 20.3.6 Patch available GHSA-q63q-pgmf-mxhr
  • @angular/ssr (npm) Vendor— Affected 21.0.0-next.0 to before 21.0.0-next.8 Fixed in 21.0.0-next.8 Patch available GHSA-q63q-pgmf-mxhr

Remediation

  • Fix · CNA angular-cli (angular) Fixed in 19.2.18, 20.3.6, 21.0.0-next.8
  • Fix · GHSA-q63q-pgmf-mxhr @angular/ssr (npm) Fixed in 19.2.18 Advisory →
  • Fix · GHSA-q63q-pgmf-mxhr @angular/ssr (npm) Fixed in 20.3.6 Advisory →
  • Fix · GHSA-q63q-pgmf-mxhr @angular/ssr (npm) Fixed in 21.0.0-next.8 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-62427
  2. 2026-10-03 Alias added: GHSA-q63q-pgmf-mxhr

References

Advisory 1

Other 3

  • TI-2026-74069 Infinite loop in Angular SSR HTML parser allows denial of service CVSS 4.0HIGH 8.7
  • TI-2026-60076 Angular: SSRF and Cross-Origin Credential Disclosure via URL Resolution Discrepancy in SSR CVSS 4.0HIGH 8.6
  • TI-2026-60080 Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fallback Raw-Content Elements CVSS 4.0HIGH 8.6
  • TI-2026-60078 Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements CVSS 4.0HIGH 8.6
  • TI-2026-22098 Angular SSR has an Open Redirect via X-Forwarded-Prefix CVSS 4.0MEDIUM 6.9
  • TI-2025-37971 A reflected cross-site scripting (XSS) vulnerability in CKeditor v46.1.0 & Angular… CVSS 3.1MEDIUM 5.4
See all 46 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences