CVE-2023-27899

Code execution via writable plugin upload temporary file

Published Mar 8, 2023 · Updated Feb 28, 2025

Insecure temporary-file permissions in Jenkins 2.393 and earlier and LTS 2.375.3 and earlier allow local users to alter uploaded plugins. Plugin uploads are staged in the shared system temporary directory with the process default creation mode instead of restrictive permissions. Exploitation requires controller filesystem access and an administrator-initiated upload; readable files expose plugin content, while writable files enable code execution.

CVSS severity7.0
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure temporary-file permissions in Jenkins 2.393 and earlier and LTS 2.375.3 and earlier allow local users to alter uploaded plugins. Plugin uploads are staged in the shared system temporary directory with the process default creation mode instead of restrictive permissions. Exploitation requires controller filesystem access and an administrator-initiated upload; readable files expose plugin content, while writable files enable code execution.

The record

CVE
CVE-2023-27899
Published
Mar 8, 2023
Updated
Feb 28, 2025
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-863, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Jenkins Project · JenkinsAffected versions are unavailable in this record.

Published CVSS scores

7.0CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

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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