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Fencer Vulns
medium 5.3

CVE-2026-41423 json

Angular: SSRF via protocol-relative and backslash URLs in Angular Platform-Server

published 2026-04-16 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-28552 , GHSA-45q2-gjvg-7973

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to versions 19.2.21, 20.3.19, 21.2.9, and 22.0.0-next.8, a Server-Side Request Forgery (SSRF) vulnerability exists in @angular/platform-server due to improper handling of URLs during Server-Side Rendering (SSR). When an attacker sends a request such as GET /\evil.com/ HTTP/1.1 the server engine (Express, etc.) passes the URL string to Angular’s rendering functions. Because the URL parser normalizes the backslash to a forward slash for HTTP/HTTPS schemes, the internal state of the application is hijacked to believe the current origin is evil.com. This misinterpretation tricks the application into treating the attacker’s domain as the local origin. Consequently, any relative HttpClient requests or PlatformLocation.hostname references are redirected to the attacker controlled server, potentially exposing internal APIs or metadata services. This issue has been patched in versions 19.2.21, 20.3.19, 21.2.9, and 22.0.0-next.8.

Patch / fix

  • npm @angular/platform-server 19.2.21, 20.3.19, 21.2.9, 22.0.0-next.8
  • angular angular 19.2.21, 20.3.19, 21.2.9, 22.0.0-next.8

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41423 updated cvss 5.3

Angular: @angular/platform-server: Angular: Server-Side Request Forgery (SSRF) leading to information exposure

  • Red Hat AMQ Broker 7 angular
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 thunderbird Red Hat Enterprise Linux 10 gjs, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Fuse 7 angular, platform-server
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Application Platform Expansion Pack angular
    affected: no fix available “Fix deferred”
  • Red Hat OpenStack Platform 16.2 qpid-dispatch-tools, qpid-dispatch-router
    affected: no fix available
  • Red Hat Single Sign-On 7 angular
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox, grafana, mozjs60, thunderbird, grafana-loki, grafana-mssql, +12 more Red Hat Enterprise Linux 9 gjs, firefox, grafana, firefox-x11, grafana-selinux Red Hat Enterprise Linux 10 firefox, grafana
    under investigation
  • Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm @angular/platform-server
>=22.0.0-next.0, <22.0.0-next.8
>=21.0.0-next.0, <21.2.9
>=20.0.0-next.0, <20.3.19
>=19.0.0-next.0, <19.2.21
<=18.2.14
22.0.0-next.8
21.2.9
20.3.19
19.2.21

Affected products

  • angular angular

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.