CVE-2023-42793Known exploitationPublic exploitNetwork attack vector

Unauthenticated RCE via wildcarded RPC2 path exemption

Published Sep 19, 2023 · Updated Oct 21, 2025

Authentication bypass in JetBrains TeamCity before 2023.05.4 allows remote attackers to execute arbitrary code through HTTP(S) requests. The RequestInterceptors class excludes every path ending in /RPC2 from pre-handling, so a crafted REST token-creation path skips authorization and returns an administrator token. Unauthenticated network access to an on-premises server is sufficient, enabling administrative control, secret theft, and build-pipeline tampering.

CVSS severity9.8
Critical
EPSS probability99.98%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in JetBrains TeamCity before 2023.05.4 allows remote attackers to execute arbitrary code through HTTP(S) requests. The RequestInterceptors class excludes every path ending in /RPC2 from pre-handling, so a crafted REST token-creation path skips authorization and returns an administrator token. Unauthenticated network access to an on-premises server is sufficient, enabling administrative control, secret theft, and build-pipeline tampering.

The record

CVE
CVE-2023-42793
Published
Sep 19, 2023
Updated
Oct 21, 2025
Vendor
JetBrains
Product
TeamCity
Classifications
CWE-288, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2023Exploitation reportedDiamond Sleet and Onyx Sleet exploitation
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <2023.05.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · TeamCityversion=0 <2023.05.4

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 20268
Sep 14, 20261
Sep 15, 2026Unavailable
Sep 16, 20262
Latest reporting daySep 16, 2026
Latest daily unique IPs2
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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