CVE-2026-57303: Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE)

Q: How do I fix CVE-2026-57303?

assembla: upgrade to newer than 1.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-57303 being exploited?

CVE-2026-57303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57303 affect?

CVE-2026-57303 affects assembla. Severity is high (CVSS 7.1). 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 c

Routine

HIGH 7.1UPGRADE

CVE-2026-57303 is a high-severity flaw (CVSS 7.1) affecting assembla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 14:17 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

jenkins assembla UPGRADE

Affected: <= 1.4

Fixed in: newer than 1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy assembla || rpm -q assembla || assembla --version

2. UPGRADE to newer than 1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade assembla

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade assembla

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57303?

assembla: upgrade to newer than 1.4. Exact commands for each OS are on this page.

Is CVE-2026-57303 being exploited?

CVE-2026-57303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57303 affect?

CVE-2026-57303 affects assembla. Severity is high (CVSS 7.1). 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 c

How urgent is CVE-2026-57303?

Priority 32/100. High severity

Software pages

Jenkins vulnerabilities

Related CVEs

CVE-2026-57304 MEDIUM 5.4 UPGRADE A missing permission check in Jenkins Assembla Plugin 1.4 and earlier allows attackers with Overall/Read permi
CVE-2026-57305 MEDIUM 5.4 UPGRADE A cross-site request forgery (CSRF) vulnerability in Jenkins Assembla Plugin 1.4 and earlier allows attackers

References

← Back to latest CVEs