CVE-2021-4121Network attack vector

Browser script execution via unencoded meeting URLs

Published Dec 16, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in YetiForce CRM before 6.4.0 allows remote authenticated users to run script through a crafted meeting URL. The MeetingModal.tpl template inserts guest, moderator, and invitation URLs into HTML attributes without encoding their values. Low-privileged access is required to store a URL, and rendering the affected meeting modal executes its payload in the browser context.

CVSS severity6.1
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in YetiForce CRM before 6.4.0 allows remote authenticated users to run script through a crafted meeting URL. The MeetingModal.tpl template inserts guest, moderator, and invitation URLs into HTML attributes without encoding their values. Low-privileged access is required to store a URL, and rendering the affected meeting modal executes its payload in the browser context.

The record

CVE
CVE-2021-4121
Published
Dec 16, 2021
Updated
Aug 3, 2024
Vendor
YetiForce
Product
YetiForce CRM
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2021CVE 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=unspecified <6.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YetiForce · YetiForce CRMversion=unspecified <6.4.0

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.4huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L

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.

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Technologies

Your stack

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Your stack

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