CVE-2026-86486Network attack vector

Unauthenticated VCS change injection via blank webhook secret

Published Sep 7, 2026 · Updated Sep 8, 2026

Authentication bypass in JetBrains YouTrack before 2026.2.18634 allows remote attackers to submit generic VCS webhook payloads. The generic VCS webhook handler treats an empty configured secret as successful authentication instead of rejecting the request. An inbound-reachable generic VCS integration with a blank secret is required; accepted payloads can attach fabricated commits to referenced issues.

CVSS severity3.7
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in JetBrains YouTrack before 2026.2.18634 allows remote attackers to submit generic VCS webhook payloads. The generic VCS webhook handler treats an empty configured secret as successful authentication instead of rejecting the request. An inbound-reachable generic VCS integration with a blank secret is required; accepted payloads can attach fabricated commits to referenced issues.

The record

CVE
CVE-2026-86486
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record 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 <2026.2.18634

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2026.2.18634

Published CVSS scores

3.7JetBrainsCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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.

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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-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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