CVE-2021-26079Network attack vector

Browser script execution via crafted fieldID

Published Jun 7, 2021 · Updated Oct 17, 2024

Cross-site scripting in CardLayoutConfigTable in Atlassian Jira Server and Jira Data Center allows remote attackers to inject script via fieldID. Atlassian identifies fieldID as the vulnerable input but has not published a patch diff or further details about the missing output neutralization. A victim must render the attacker-controlled field value in a browser, allowing arbitrary HTML or JavaScript to run in the Jira origin.

CVSS severity6.1
Medium
EPSS probability1.24%
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 CardLayoutConfigTable in Atlassian Jira Server and Jira Data Center allows remote attackers to inject script via fieldID. Atlassian identifies fieldID as the vulnerable input but has not published a patch diff or further details about the missing output neutralization. A victim must render the attacker-controlled field value in a browser, allowing arbitrary HTML or JavaScript to run in the Jira origin.

The record

CVE
CVE-2021-26079
Published
Jun 7, 2021
Updated
Oct 17, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

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

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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 <8.13.7
  4. Affected versionversion=unspecified <8.17.0
  5. Affected versionversion=unspecified <8.5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Serverversion=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.7; version=unspecified <8.17.0; version=unspecified <8.5.15
Atlassian · Jira Data Centerversion=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.7; version=unspecified <8.17.0; version=unspecified <8.5.15

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV: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
Privilegesunauthenticated
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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