CVE-2024-56355Network attack vector

Authenticated cross-site scripting via missing response content type

Published Dec 20, 2024 · Updated Dec 20, 2024

Cross-site scripting in JetBrains TeamCity before 2024.12 allows remote authenticated users to execute script in another user's browser. RemoteBuildLogController omits Content-Type from a build-log response, allowing a browser to interpret attacker-influenced response data as active content. Exploitation requires low-privileged access and user interaction; successful script execution can read or alter data available to the victim's TeamCity session.

CVSS severity4.6
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in JetBrains TeamCity before 2024.12 allows remote authenticated users to execute script in another user's browser. RemoteBuildLogController omits Content-Type from a build-log response, allowing a browser to interpret attacker-influenced response data as active content. Exploitation requires low-privileged access and user interaction; successful script execution can read or alter data available to the victim's TeamCity session.

The record

CVE
CVE-2024-56355
Published
Dec 20, 2024
Updated
Dec 20, 2024
Vendor
JetBrains
Product
TeamCity
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 20, 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 <2024.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · TeamCityversion=0 <2024.12

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.6JetBrains s.r.o.CVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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