CVE-2021-24123Public exploitNetwork attack vector

Administrator-level code execution via unverified feed artwork

Published Mar 18, 2021 · Updated Aug 3, 2024

Unrestricted file upload in Blubrry PowerPress before 8.3.8 allows remote authenticated users to execute PHP through feed artwork. The feed-settings handler accepts an rss2_image_file named with a PHP extension and stores its unverified content under the web-accessible PowerPress uploads directory. Administrator access and a valid settings nonce are required; requesting the stored PHP file executes attacker-supplied code in the WordPress server context.

CVSS severity7.2
High
EPSS probability1.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Blubrry PowerPress before 8.3.8 allows remote authenticated users to execute PHP through feed artwork. The feed-settings handler accepts an rss2_image_file named with a PHP extension and stores its unverified content under the web-accessible PowerPress uploads directory. Administrator access and a valid settings nonce are required; requesting the stored PHP file executes attacker-supplied code in the WordPress server context.

The record

CVE
CVE-2021-24123
Published
Mar 18, 2021
Updated
Aug 3, 2024
Vendor
Blubrry
Product
PowerPress
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 18, 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=8.3.8 <8.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Blubrry · PowerPressversion=8.3.8 <8.3.8

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

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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