5.4

CVE-2021-21660: jenkins project jenkins markdown formatter plugin Cross-site Scripting

Modified
AliasesGHSA-xqpp-26pp-2365
Published 25-05-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-21660 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in jenkins project jenkins markdown formatter plugin. EPSS estimates a 1.09% chance of exploitation in the next 30 days, higher than 65% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (NVD)
EPSS score
1.09%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 25-05-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.09%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.09% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Io.jenkins.plugins1 product
  • markdown-formatter< 0.2.0
Jenkins1 product
Jenkins project1 product

3 vendors · 3 products

References

6 links