CVE-2021-41304Network attack vector

Unauthenticated script execution via importer error reflection

Published Oct 26, 2021 · Updated Oct 10, 2024

Cross-site scripting in Atlassian Jira Server and Data Center before 8.13.12 and 8.14.0 through 8.20.1 allows remote attackers to inject script. The /secure/admin/ImporterFinishedPage.jspa error-message path returns attacker-controlled HTML or JavaScript without neutralizing it for page output. No authentication is required, but a user must follow a crafted request before the injected code runs in the Jira origin and can read or alter browser-accessible data.

CVSS severity6.1
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Atlassian Jira Server and Data Center before 8.13.12 and 8.14.0 through 8.20.1 allows remote attackers to inject script. The /secure/admin/ImporterFinishedPage.jspa error-message path returns attacker-controlled HTML or JavaScript without neutralizing it for page output. No authentication is required, but a user must follow a crafted request before the injected code runs in the Jira origin and can read or alter browser-accessible data.

The record

CVE
CVE-2021-41304
Published
Oct 26, 2021
Updated
Oct 10, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 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=8.14.0 <unspecified
  2. Affected versionversion=unspecified <8.13.12
  3. Affected versionversion=unspecified <8.20.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Serverversion=8.14.0 <unspecified; version=unspecified <8.13.12; version=unspecified <8.20.2
Atlassian · Jira Data Centerversion=8.14.0 <unspecified; version=unspecified <8.13.12; version=unspecified <8.20.2

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 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

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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