CVE-2020-29444Network attack vector

Persistent XSS via unsanitized global settings

Published May 7, 2021 · Updated Feb 12, 2025

Persistent XSS in Team Calendars for Atlassian Confluence Server before 7.11.0 allows attackers to inject HTML or JavaScript. Administrative global-setting parameters retain executable markup without neutralizing it before the affected content is rendered. Exploitation requires authenticated access to submit an affected setting and user interaction to execute the stored script in another browser context.

CVSS severity5.4
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Persistent XSS in Team Calendars for Atlassian Confluence Server before 7.11.0 allows attackers to inject HTML or JavaScript. Administrative global-setting parameters retain executable markup without neutralizing it before the affected content is rendered. Exploitation requires authenticated access to submit an affected setting and user interaction to execute the stored script in another browser context.

The record

CVE
CVE-2020-29444
Published
May 7, 2021
Updated
Feb 12, 2025
Vendor
Atlassian
Product
Confluence Server
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record 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=unspecified <7.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Atlassian · Confluence Serverversion=unspecified <7.11.0

Published CVSS scores

5.4CISA-ADPCVSS: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
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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')
T1059.007JavaScript/JScript

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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