CVE-2021-26083Network attack vector

Stored XSS via unneutralized filter names

Published Jul 20, 2021 · Updated Oct 17, 2024

Stored XSS in Export HTML Report in affected Atlassian Jira Server and Jira Data Center releases allows remote attackers to execute script. A filter name is inserted into the exported HTML report without neutralizing HTML or JavaScript, so the saved name becomes executable content. A Jira account able to create a filter and a user who opens its HTML report are required; affected releases are before 8.5.14, 8.6.0 through 8.13.5, and 8.14.0 through 8.16.0.

CVSS severity5.4
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Export HTML Report in affected Atlassian Jira Server and Jira Data Center releases allows remote attackers to execute script. A filter name is inserted into the exported HTML report without neutralizing HTML or JavaScript, so the saved name becomes executable content. A Jira account able to create a filter and a user who opens its HTML report are required; affected releases are before 8.5.14, 8.6.0 through 8.13.5, and 8.14.0 through 8.16.0.

The record

CVE
CVE-2021-26083
Published
Jul 20, 2021
Updated
Oct 17, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 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

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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=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

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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