Medium severity · published Jan 13, 2021
CVE-2021-21610
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…
6.1
CVSS
1.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JE
Jenkins · Jenkins
through 2.263.1; through 2.274 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21610
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21610
Vendor Advisory
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153
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