CVE-2023-30521Network attack vector

Unauthenticated build triggering via unprotected webhook endpoint

Published Apr 12, 2023 · Updated Feb 7, 2025

Missing authorization in Jenkins Assembla merge request builder Plugin 1.1.13 and earlier allows remote attackers to trigger builds. The /assembla-webhook/ endpoint accepts unauthenticated requests and selects jobs configured for an attacker-specified repository. Exploitation requires a reachable Jenkins controller with the plugin enabled and a matching job, and the bounded consequence is an unauthorized build execution.

CVSS severity5.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Jenkins Assembla merge request builder Plugin 1.1.13 and earlier allows remote attackers to trigger builds. The /assembla-webhook/ endpoint accepts unauthenticated requests and selects jobs configured for an attacker-specified repository. Exploitation requires a reachable Jenkins controller with the plugin enabled and a matching job, and the bounded consequence is an unauthorized build execution.

The record

CVE
CVE-2023-30521
Published
Apr 12, 2023
Updated
Feb 7, 2025
Vendor
Jenkins Project
Product
Assembla merge request builder
Classifications
CWE-862
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Assembla merge request builderversion=0 <=1.1.13

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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