CVE-2021-21660
Jenkins Markdown Formatter Plugin 0.1.0 and earlier does not sanitize crafted link target URLs, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the…
Does this matter?
Lower severity and a low EPSS score (1.09%). Track it; it rarely justifies an emergency change on its own.
Description
Jenkins Markdown Formatter Plugin 0.1.0 and earlier does not sanitize crafted link target URLs, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the configured markup formatter.
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.09% probability · 65th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- jenkins/markdown formatter
- Source
- jenkinsci-cert@googlegroups.com
EPSS 1.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/05/25/3Mailing List, Third Party Advisory
- https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198Vendor Advisory
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/25/3Mailing List, Third Party Advisory
- https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198Vendor Advisory
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.