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Fencer Vulns
medium 6.1

CVE-2021-26078 json

The number range searcher component in Jira Server and Jira Data Center before version 8.5.14, from version 8.6.0 before version 8.13.6, an…

published 2021-06-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-12899

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
1
Exploit-DB

Summary

The number range searcher component in Jira Server and Jira Data Center before version 8.5.14, from version 8.6.0 before version 8.13.6, and from version 8.14.0 before version 8.16.1 allows remote attackers inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability.

Patch / fix

  • Atlassian Jira Server 8.5.14, 8.13.6, 8.16.1
  • Atlassian Jira Data Center 8.5.14, 8.13.6, 8.16.1

Timeline

  1. Published
  2. First public exploit (EDB-50068)

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

4.03% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50068 Atlassian Jira Server Data Center 8.16.0 - Reflected Cross-Site Scripting (XSS) webapps, 2021-06-28
  • packetstormsecurity.com http://packetstormsecurity.com/files/163289/Atlassian-Jira-Server-Data-Center-8.16.0-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Atlassian Jira Server
  • Atlassian Jira Data Center

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns 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.