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MEDIUM severity

CVE-2023-30521 — assembla-merge-request-bu…

MEDIUM

CVE-2023-30521 is a medium-severity (CVSS 5.3) CWE-862 vulnerability in org.jenkins-ci.plugins:assembla-merge-request-builder. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Jenkins Assembla merge request builder Plugin missing authentication to access endpoint

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-30521.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk
0.02%0.56%1.10%1.64%1.1%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.jenkins-ci.plugins:assembla-merge-request-builder

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins Assembla merge request builder Plugin provides a webhook endpoint at /assembla-webhook/ that can be used to trigger builds of jobs configured to use a specified repository.

In Assembla merge request builder Plugin 1.1.13 and earlier, this endpoint can be accessed without authentication. This allows unauthenticated attackers to trigger builds of jobs corresponding to the attacker-specified repository.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:assembla-merge-request-builderall versionsNo fix

Affected Products

1 product · 1 configurations
Application
assembla merge request builderjenkins
≤ 1.1.13
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:assembla-merge-request-builder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of org.jenkins-ci.plugins:assembla-merge-request-builder for CVE-2023-30521. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Jenkins Assembla merge request builder Plugin provides a webhook endpoint at `/assembla-webhook/` that can be used to trigger builds of jobs configured to use a specified repository. In Assembla merge request builder Plugin 1.1.13 and earlier, this endpoint can be accessed without authentication. This allows unauthenticated attackers to trigger builds of jobs corresponding to the attacker-specified repository.
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CVE-2023-30521: assembla-merge-request (Medium 5.3)