CVE-2024-54156Network attack vector

Data modification via prototype-polluting merge functions

Published Dec 4, 2024 · Updated Dec 4, 2024

Prototype pollution in JetBrains YouTrack before 2024.3.52635 allows remote attackers to modify application object properties via crafted input. The affected merge functions fail to block prototype-resolving keys while copying object attributes, allowing crafted input to alter attributes inherited by other objects. Exploitation requires user interaction and additional conditions, and the published impact is limited to application data disclosure or modification.

CVSS severity4.2
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in JetBrains YouTrack before 2024.3.52635 allows remote attackers to modify application object properties via crafted input. The affected merge functions fail to block prototype-resolving keys while copying object attributes, allowing crafted input to alter attributes inherited by other objects. Exploitation requires user interaction and additional conditions, and the published impact is limited to application data disclosure or modification.

The record

CVE
CVE-2024-54156
Published
Dec 4, 2024
Updated
Dec 4, 2024
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-1321, CAPEC-180, CAPEC-77, CAPEC-1, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 4, 2024Record 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 <2024.3.52635

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2024.3.52635

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
4.2JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
CAPEC-77Manipulating User-Controlled Variables
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

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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