CVE-2023-34226Network attack vector

Browser-session data access via reflected Subscriptions input

Published May 31, 2023 · Updated Jan 9, 2025

Reflected XSS in JetBrains TeamCity before 2023.05 allows remote authenticated users to execute script through the Subscriptions page. JetBrains identifies the affected page but does not disclose which request value is reflected or where output encoding fails. Exploitation requires low-privileged access and a user to open a crafted request; the script can read or modify data available to that user's TeamCity browser session.

CVSS severity4.6
Medium
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in JetBrains TeamCity before 2023.05 allows remote authenticated users to execute script through the Subscriptions page. JetBrains identifies the affected page but does not disclose which request value is reflected or where output encoding fails. Exploitation requires low-privileged access and a user to open a crafted request; the script can read or modify data available to that user's TeamCity browser session.

The record

CVE
CVE-2023-34226
Published
May 31, 2023
Updated
Jan 9, 2025
Vendor
JetBrains
Product
TeamCity
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 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 <2023.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

JetBrains · TeamCityversion=0 <2023.05

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1204.001Malicious Link

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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