CVE-2022-21650Public exploitNetwork attack vector

Stored XSS via disguised SVG upload

Published Jan 4, 2022 · Updated Apr 22, 2025

Stored XSS in Convos 6.48 through 6.51 allows remote authenticated users to execute script in another user's browser via file upload. The chat upload filter rejects the .svg extension but accepts the same SVG content when its filename ends in .html, serving active markup. An account is required to upload the file, and script execution occurs when another user views it, exposing that browser session to attacker-controlled code.

CVSS severity7.6
High
EPSS probability0.83%
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 Convos 6.48 through 6.51 allows remote authenticated users to execute script in another user's browser via file upload. The chat upload filter rejects the .svg extension but accepts the same SVG content when its filename ends in .html, serving active markup. An account is required to upload the file, and script execution occurs when another user views it, exposing that browser session to attacker-controlled code.

The record

CVE
CVE-2022-21650
Published
Jan 4, 2022
Updated
Apr 22, 2025
Vendor
Convos Chat
Product
Convos
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=>= 6.48, < 6.52

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Convos Chat · Convosversion=>= 6.48, < 6.52

Published CVSS scores

7.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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