High severity · published Jun 24, 2026
CVE-2026-57303
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…
7.1
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JA
Jenkins Assembla Plugin · Jenkins Project
through 1.4 · source: vendor
AS
Assembla · Jenkins
through 1.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57303
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57303
Vendor Advisory
https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3692%20(1)
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