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Fencer Intel
medium 5.3

CVE-2019-8449 json

The /rest/api/latest/groupuserpicker resource in Jira before version 8.4.0 allows remote attackers to enumerate usernames via an informatio…

published 7y ago modified 4mo ago also EUVD-2019-17839

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
85.7%
EPSS 85.7% chance of exploitation in 30 days, percentile 99.7%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

The /rest/api/latest/groupuserpicker resource in Jira before version 8.4.0 allows remote attackers to enumerate usernames via an information disclosure vulnerability.

Patch / fix

  • Atlassian Jira 8.4.0

Is CVE-2019-8449 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. Published
  2. First public exploit (EDB-47990)

Exploit prediction

85.74% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-47990 Jira 8.3.4 - Information Disclosure (Username Enumeration) webapps, 2020-02-03
  • Nuclei template Jira <8.4.0 - Information Disclosure nuclei detection template
  • packetstormsecurity.com http://packetstormsecurity.com/files/156172/Jira-8.3.4-Information-Disclosure.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Atlassian Jira

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.