CVE-2026-16293Public exploitNetwork attack vector

Contributor-to-Administrator script execution via unescaped Chapters URL

Published Aug 4, 2026 · Updated Aug 4, 2026

Stored XSS in Blubrry PowerPress before 11.16.11 allows remote authenticated users to execute script via a crafted Chapters URL. The Podcast Episode metabox stores the pci_chapters_url value verbatim in serialized enclosure metadata after applying only stripslashes, then inserts it unescaped into a link when the post is edited. Contributor access is sufficient, and execution requires an Editor or Administrator to open the affected post in the editor, where the script runs in the site's origin despite unfiltered_html being unavailable.

CVSS severity6.8
Medium
EPSS probability0.23%
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 11.16.11 allows remote authenticated users to execute script via a crafted Chapters URL. The Podcast Episode metabox stores the pci_chapters_url value verbatim in serialized enclosure metadata after applying only stripslashes, then inserts it unescaped into a link when the post is edited. Contributor access is sufficient, and execution requires an Editor or Administrator to open the affected post in the editor, where the script runs in the site's origin despite unfiltered_html being unavailable.

The record

CVE
CVE-2026-16293
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Blubrry
Product
PowerPress
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <11.16.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Blubrry · PowerPressversion=0 <11.16.11

Published CVSS scores

6.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/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.

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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')
T1203Exploitation for Client Execution

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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