CVE-2022-21649Public exploitNetwork attack vector

Stored XSS via unescaped link attributes

Published Jan 4, 2022 · Updated Apr 22, 2025

Stored XSS in Convos 6.49 through 6.51 allows remote authenticated users to execute scripts in another user's browser via a crafted chat URL. The I18N.md link formatter converts text beginning with https:// into an anchor but fails to escape double quotes before inserting the URL into href. An attacker must be able to post a chat message, and a victim must render the stored message for autofocus and onfocus attributes to run the injected script.

CVSS severity7.6
High
EPSS probability0.93%
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 6.49 through 6.51 allows remote authenticated users to execute scripts in another user's browser via a crafted chat URL. The I18N.md link formatter converts text beginning with https:// into an anchor but fails to escape double quotes before inserting the URL into href. An attacker must be able to post a chat message, and a victim must render the stored message for autofocus and onfocus attributes to run the injected script.

The record

CVE
CVE-2022-21649
Published
Jan 4, 2022
Updated
Apr 22, 2025
Vendor
Convos Chat
Product
Convos
Classifications
CWE-79, T1059.007
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.49, < 6.52

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Convos Chat · Convosversion=>= 6.49, < 6.52

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
7.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
5.4NVDCVSS: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 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')
T1059.007JavaScript/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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