CVE-2021-40639Public exploitNetwork attack vector

Unauthenticated sensitive-file disclosure via file-manager download

Published Sep 15, 2021 · Updated Jul 9, 2026

Improper access control in JFinal CMS 5.1.0 allows remote attackers to read sensitive files via a crafted file-manager download request. The file-manager download handler accepts a path under the web directory and serves files such as WEB-INF/classes/conf/db.properties without enforcing authorization or constraining traversal. The endpoint is remotely reachable without authentication, exposing database credentials and other configuration data; the record does not show integrity or service-interruption impact.

CVSS severity7.5
High
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in JFinal CMS 5.1.0 allows remote attackers to read sensitive files via a crafted file-manager download request. The file-manager download handler accepts a path under the web directory and serves files such as WEB-INF/classes/conf/db.properties without enforcing authorization or constraining traversal. The endpoint is remotely reachable without authentication, exposing database credentials and other configuration data; the record does not show integrity or service-interruption impact.

The record

CVE
CVE-2021-40639
Published
Sep 15, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668, CWE-863, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
CWE-863Incorrect Authorization
T1005Data from Local System

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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