Angular up to 21.1.x cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Angular up to 18.2.14/19.2.18/20.3.16/21.1.5/21.1.x. This affects an unknown part. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-27970. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Angular up to 18.2.14/19.2.18/20.3.16/21.1.5/21.1.x and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Versions prior to 21.2.0, 21.1.16, 20.3.17, and 19.2.19 have a cross-Site scripting vulnerability in the Angular internationalization (i18n) pipeline. In ICU messages (International Components for Unicode), HTML from translated content was not properly sanitized and could execute arbitrary JavaScript. Angular i18n typically involves three steps, extracting all messages from an application in the source language, sending the messages to be translated, and then merging their translations back into the final source code. Translations are frequently handled by contracts with specific partner companies, and involve sending the source messages to a separate contractor before receiving final translations for display to the end user. If the returned translations have malicious content, it could be rendered into the application and execute arbitrary JavaScript. When successfully exploited, this vulnerability allows for execution of attacker controlled JavaScript in the application origin. Depending on the nature of the application being exploited this could lead to credential exfiltration and/or page vandalism. Several preconditions apply to the attack. The attacker must compromise the translation file (xliff, xtb, etc.). Unlike most XSS vulnerabilities, this issue is not exploitable by arbitrary users. An attacker must first compromise an application's translation file before they can escalate privileges into the Angular application client. The victim application must use Angular i18n, use one or more ICU messages, render an ICU message, and not defend against XSS via a safe content security policy. Versions 21.2.0, 21.1.6, 20.3.17, and 19.2.19 patch the issue. Until the patch is applied, developers should consider reviewing and verifying translated content received from untrusted third parties before incorporating it in an Angular application, enabling strict CSP controls to block unauthorized JavaScript from executing on the page, and enabling Trusted Types to enforce proper HTML sanitization.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-27970 since 02/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 300236 (Linux Distros Unpatched Vulnerability : CVE-2026-27970), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 19.2.19, 20.3.17, 21.1.6 or 21.2.0 eliminates this vulnerability. Applying the patch 306f367899dfc2e04238fecd3455547b5d54075d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (300236), EUVD (EUVD-2026-8822) and CERT Bund (WID-SEC-2026-0534). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Open Source Angular

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 300236
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-27970

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Angular 19.2.19/20.3.17/21.1.6/21.2.0
Patch: 306f367899dfc2e04238fecd3455547b5d54075d

Timelineinfo

02/25/2026 CVE reserved
02/26/2026 +1 days Advisory disclosed
02/26/2026 +0 days VulDB entry created
03/03/2026 +5 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-prjf-86w9-mfqv
Status: Confirmed

CVE: CVE-2026-27970 (🔒)
GCVE (CVE): GCVE-0-2026-27970
GCVE (VulDB): GCVE-100-347954
EUVD: 🔒
CERT Bund: WID-SEC-2026-0534 - Angular SSR und Core: Mehrere Schwachstellen

Entryinfo

Created: 02/26/2026 07:29
Updated: 03/03/2026 07:46
Changes: 02/26/2026 07:29 (69), 02/27/2026 03:34 (7), 03/01/2026 05:57 (1), 03/01/2026 15:35 (12), 03/03/2026 07:46 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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