Jenkins User1st uTester Plugin vulnerability exposes unencrypted token to authenticated users

published 2025-07-09 16 mo ago modified 2026-06-17 4 mo ago also GHSA-w4xv-mj6v-p4g2 , EUVD-2025-20836

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

Jenkins User1st uTester Plugin 1.1 and earlier stores the uTester JWT token unencrypted in its global configuration file on the Jenkins controller, where it can be viewed by users with access to the Jenkins controller file system.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 16 mo ago (2025-07-09)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
GitHub	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	io.jenkins.plugins:user1st-utester	<=1.1	no fix listed

Affected products

Jenkins Project Jenkins User1st uTester Plugin

Classification

Weakness

CWE-311 Missing Encryption of Sensitive Data

References

jenkins.io /security/advisory/2025-07-09/#SECURITY-3518
vendor-advisory, web
openwall.com /lists/oss-security/2025/07/09/4
web
nvd.nist.gov /vuln/detail/CVE-2025-53678
advisory
github.com /jenkinsci/user1st-utester-plugin
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary