Jenkins Assembla Plugin has an XXE vulnerability

published 2026-06-24 4 mo ago modified 2026-10-25 14 d ago also GHSA-2q27-6p2h-q6r3 , EUVD-2026-38784

cvss: 7.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits: 0; none known

Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks, allowing attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 4 mo ago (2026-06-24)

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CNA	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
GitHub	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.jenkins-ci.plugins:assembla	<=1.4	no fix listed

Affected products

Jenkins Project Jenkins Assembla Plugin

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

jenkins.io /security/advisory/2026-06-24/#SECURITY-3692%20(1)
vendor-advisory, web
nvd.nist.gov /vuln/detail/CVE-2026-57303
advisory
github.com /lucamilanesio/assembla-jenkins-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