CVE-2019-20403Network attack vector

Unauthenticated project-key enumeration via validation API oracle

Published Feb 6, 2020 · Updated Sep 16, 2024

Information disclosure in Atlassian Jira Server before 8.6.0 allows remote attackers to determine whether a project key exists. The Jira Importers Plugin API exposes a project-key validation result to unauthenticated requests, creating an existence oracle. Network access to the API is sufficient to enumerate valid project keys, but the disclosed information is limited to whether a tested key exists.

CVSS severity5.3
Medium
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Atlassian Jira Server before 8.6.0 allows remote attackers to determine whether a project key exists. The Jira Importers Plugin API exposes a project-key validation result to unauthenticated requests, creating an existence oracle. Network access to the API is sufficient to enumerate valid project keys, but the disclosed information is limited to whether a tested key exists.

The record

CVE
CVE-2019-20403
Published
Feb 6, 2020
Updated
Sep 16, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <8.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Serverversion=unspecified <8.6.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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