CVE-2021-26078Public exploitNetwork attack vector

Reflected XSS via unescaped JQL range value

Published Jun 7, 2021 · Updated Oct 17, 2024

Reflected XSS in affected Jira Server and Jira Data Center releases allows remote authenticated users to execute script through crafted JQL. The number range search template renders a crafted Story Points range value from the jql parameter without neutralizing HTML, so a quote sequence introduces a script element. A lowest-privilege account and the number range searcher configuration are required; a browser must render the response, and impact remains browser-context script execution.

CVSS severity6.1
Medium
EPSS probability4.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in affected Jira Server and Jira Data Center releases allows remote authenticated users to execute script through crafted JQL. The number range search template renders a crafted Story Points range value from the jql parameter without neutralizing HTML, so a quote sequence introduces a script element. A lowest-privilege account and the number range searcher configuration are required; a browser must render the response, and impact remains browser-context script execution.

The record

CVE
CVE-2021-26078
Published
Jun 7, 2021
Updated
Oct 17, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 2024Record 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=8.14.0 <unspecified
  2. Affected versionversion=8.6.0 <unspecified
  3. Affected versionversion=unspecified <8.13.6
  4. Affected versionversion=unspecified <8.16.1
  5. Affected versionversion=unspecified <8.5.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Atlassian · Jira Serverversion=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.6; version=unspecified <8.16.1; version=unspecified <8.5.14
Atlassian · Jira Data Centerversion=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.6; version=unspecified <8.16.1; version=unspecified <8.5.14

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:N/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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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