CVE-2021-21610

jenkins: Reflected XSS vulnerability in markup formatter preview

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup.

Jenkins versiones 2.274 y anteriores, LTS versiones 2.263.1 y anteriores, no implementan ninguna restricción para la URL que presenta una vista previa formateada del marcado pasado como un parámetro de consulta, resultando en una vulnerabilidad de tipo cross-site scripting (XSS) reflejada si el formateador de marcado configurado no prohíbe elementos no seguros (JavaScript) en el marcado.

A flaw was found in jenkins. A cross-site scripting (XSS) vulnerability is possible due to the lack of restrictions in URL rendering in the formatted previews of markup passed as a query parameter if the configured markup formatter does not prohibit unsafe elements in the markup. The highest threat from this vulnerability is to data confidentiality and integrity.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-04 CVE Reserved
2021-01-13 CVE Published
2023-09-29 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153	2023-11-02
https://access.redhat.com/security/cve/CVE-2021-21610	2021-03-03
https://bugzilla.redhat.com/show_bug.cgi?id=1925151	2021-03-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Jenkins Search vendor "Jenkins"		Jenkins Search vendor "Jenkins" for product "Jenkins"				<= 2.263.1 Search vendor "Jenkins" for product "Jenkins" and version " <= 2.263.1"		lts		Affected
Jenkins Search vendor "Jenkins"		Jenkins Search vendor "Jenkins" for product "Jenkins"				<= 2.274 Search vendor "Jenkins" for product "Jenkins" and version " <= 2.274"		-		Affected