CVE-2021-4116

Stored browser script execution via unpurified filenames

Published Dec 15, 2021 · Updated Aug 3, 2024

Stored XSS in YetiForce CRM before 6.4.0 allows attackers to execute scripts through a crafted uploaded filename. app/Fields/File.php accepted filenames and image metadata without consistently purifying HTML event attributes before stored values were rendered. Exploitation requires low-privileged upload access and another user to view the stored value, exposing that user's browser session to attacker-controlled script actions.

CVSS severity6.6
Medium
EPSS probability0.46%
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 YetiForce CRM before 6.4.0 allows attackers to execute scripts through a crafted uploaded filename. app/Fields/File.php accepted filenames and image metadata without consistently purifying HTML event attributes before stored values were rendered. Exploitation requires low-privileged upload access and another user to view the stored value, exposing that user's browser session to attacker-controlled script actions.

The record

CVE
CVE-2021-4116
Published
Dec 15, 2021
Updated
Aug 3, 2024
Vendor
YetiForce
Product
YetiForce CRM
Classifications
CWE-79, T1059.007
Attack vector
Unavailable
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 15, 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 vectorUnavailable in this record.
Required privilegesauthenticated

What is affected?

YetiForce · YetiForce CRMversion=unspecified <6.4.0

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.6GitHub Advisory DatabaseCVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:C/C:L/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)
VectorUnavailable
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

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

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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