CVE-2021-3741Network attack vector

Stored XSS via unrestricted SVG avatar uploads

Published Nov 15, 2024 · Updated Nov 20, 2024

Stored XSS in Chatwoot before 2.6 allows remote authenticated users to execute JavaScript by uploading an SVG profile avatar. The Avatarable concern accepted attached avatars without a content-type allowlist, causing image/svg+xml content to be stored and served as an avatar. A victim must open the avatar in a new page, where the embedded payload runs in the victim's browser and can read or modify data available to that session.

CVSS severity5.4
Medium
EPSS probability0.29%
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 Chatwoot before 2.6 allows remote authenticated users to execute JavaScript by uploading an SVG profile avatar. The Avatarable concern accepted attached avatars without a content-type allowlist, causing image/svg+xml content to be stored and served as an avatar. A victim must open the avatar in a new page, where the embedded payload runs in the victim's browser and can read or modify data available to that session.

The record

CVE
CVE-2021-3741
Published
Nov 15, 2024
Updated
Nov 20, 2024
Vendor
Chatwoot
Product
Chatwoot
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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 <2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chatwoot · Chatwootversion=unspecified <2.6

Published CVSS scores

7.8huntr.devCVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:H
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')
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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