CVE-2020-22535Public exploitNetwork attack vector

Authenticated file disclosure via unfiltered upgrade path

Published Jul 9, 2021 · Updated Aug 4, 2024

Arbitrary file download in PbootCMS 2.0.6 allows remote authenticated users to read server files via the upgrade list parameter. The update function in upgradecontroller.php concatenates the unfiltered list value into a path, copies the selected file beneath static/backup/upgrade, and leaves it web-accessible. Access to the administrative interface is required, and successful exploitation discloses files readable by the web application account.

CVSS severity6.5
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file download in PbootCMS 2.0.6 allows remote authenticated users to read server files via the upgrade list parameter. The update function in upgradecontroller.php concatenates the unfiltered list value into a path, copies the selected file beneath static/backup/upgrade, and leaves it web-accessible. Access to the administrative interface is required, and successful exploitation discloses files readable by the web application account.

The record

CVE
CVE-2020-22535
Published
Jul 9, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
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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