Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-44437

Severity CVSS v4.0:
MEDIUM
Type:
CWE-22 Path Traversal
Publication date:
13/05/2026
Last modified:
28/05/2026

Description

The Angular SSR is a server-rise rendering tool for Angular applications. From 19.0.0-next.0 to before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7, a vulnerability exists in the X-Forwarded-Prefix header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic.<br /> When an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 6.90 MEDIUM
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): Low
Availability (VA): None
Confidentiality (SC): Low
Integrity (SI): Low
Availability (SA): None

Base Score 4.0
6.90
Severity 4.0
MEDIUM
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.10 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Changed
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x
6.10
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:angular:angular_cli:*:*:*:*:*:node.js:*:* 19.0.0 (including) 19.2.25 (excluding)
cpe:2.3:a:angular:angular_cli:*:*:*:*:*:node.js:*:* 20.0.0 (including) 20.3.25 (excluding)
cpe:2.3:a:angular:angular_cli:*:*:*:*:*:node.js:*:* 21.0.0 (including) 21.2.9 (excluding)
cpe:2.3:a:angular:angular_cli:22.0.0:next0:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next1:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next2:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next3:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next4:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next5:*:*:*:node.js:*:*
cpe:2.3:a:angular:angular_cli:22.0.0:next6:*:*:*:node.js:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools