CVE-2020-36523Public exploitNetwork attack vector

Stored XSS via unsanitized datasources parameter

Published Jun 3, 2022 · Updated Apr 15, 2025

Stored XSS in the Database Information macro in avono AG PlantUML for Confluence 6.43 allows remote authenticated users to inject JavaScript. The macro accepts the datasources parameter without neutralizing script markup and stores it in a Confluence page. The injected code runs when another user visits the crafted page, permitting reads or changes within that user's Confluence session.

CVSS severity5.4
Medium
EPSS probability0.59%
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 the Database Information macro in avono AG PlantUML for Confluence 6.43 allows remote authenticated users to inject JavaScript. The macro accepts the datasources parameter without neutralizing script markup and stores it in a Confluence page. The injected code runs when another user visits the crafted page, permitting reads or changes within that user's Confluence session.

The record

CVE
CVE-2020-36523
Published
Jun 3, 2022
Updated
Apr 15, 2025
Vendor
avono AG
Product
PlantUML for Confluence
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=6.43

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

avono AG · PlantUML for Confluenceversion=6.43

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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 exploitPublished

Weakness, pattern, technique

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

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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