CVE-2023-4820Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped media URL

Published Oct 16, 2023 · Updated Mar 5, 2025

Stored XSS in Blubrry PowerPress before 11.0.12 allows remote authenticated users to inject scripts through a post's media URL field. The plugin stores the media URL without sanitizing it and renders the value without output escaping, allowing embedded event handlers to execute. Contributor-level access is sufficient; execution requires a site administrator or super administrator to view the affected content.

CVSS severity5.4
Medium
EPSS probability0.40%
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 Blubrry PowerPress before 11.0.12 allows remote authenticated users to inject scripts through a post's media URL field. The plugin stores the media URL without sanitizing it and renders the value without output escaping, allowing embedded event handlers to execute. Contributor-level access is sufficient; execution requires a site administrator or super administrator to view the affected content.

The record

CVE
CVE-2023-4820
Published
Oct 16, 2023
Updated
Mar 5, 2025
Vendor
Blubrry
Product
PowerPress
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2025Record 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=0 <11.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Blubrry · PowerPressversion=0 <11.0.12

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NVDCVSS: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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