CVE-2022-21830Public exploitNetwork attack vector

Victim-context script execution via unsanitized pasted chat

Published Apr 1, 2022 · Updated Aug 3, 2024

Cross-site scripting in Rocket.Chat LiveChat before 1.9.0 allows remote attackers to execute script in a victim's browser via pasted chat content. The Composer passes pasted text onward unchanged, while renderMarkdown returns generated HTML without sanitizing it before message display. Exploitation requires a victim to paste attacker-supplied content into the chat; the script can read or modify data available to that browser context.

CVSS severity6.1
Medium
EPSS probability0.77%
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 Rocket.Chat LiveChat before 1.9.0 allows remote attackers to execute script in a victim's browser via pasted chat content. The Composer passes pasted text onward unchanged, while renderMarkdown returns generated HTML without sanitizing it before message display. Exploitation requires a victim to paste attacker-supplied content into the chat; the script can read or modify data available to that browser context.

The record

CVE
CVE-2022-21830
Published
Apr 1, 2022
Updated
Aug 3, 2024
Vendor
Rocket.Chat Technologies Corp.
Product
Rocket.Chat LiveChat
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Fixed in v1.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocket.Chat Technologies Corp. · Rocket.Chat LiveChatversion=Fixed in v1.9

Published CVSS scores

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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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