CVE-2022-1231Public exploitNetwork attack vector

Stored XSS via lowercased embedded SVG links

Published Apr 15, 2022 · Updated Aug 2, 2024

Stored XSS in PlantUML before 1.2022.4 allows remote attackers to execute script when generated SVG is embedded in a web page. UImageSvg.clean lowercases and strips whitespace from untrusted SVG for element checks, then returns that altered markup instead of the original input. Exploitation requires a consuming application to embed the SVG and a victim to interact with its attacker-controlled content; consequences remain within the embedding context.

CVSS severity9.3
Critical
EPSS probability1.96%
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 PlantUML before 1.2022.4 allows remote attackers to execute script when generated SVG is embedded in a web page. UImageSvg.clean lowercases and strips whitespace from untrusted SVG for element checks, then returns that altered markup instead of the original input. Exploitation requires a consuming application to embed the SVG and a victim to interact with its attacker-controlled content; consequences remain within the embedding context.

The record

CVE
CVE-2022-1231
Published
Apr 15, 2022
Updated
Aug 2, 2024
Vendor
PlantUML
Product
PlantUML
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=unspecified <1.2022.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PlantUML · PlantUMLversion=unspecified <1.2022.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
9.3huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
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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