CVE-2026-66617Network attack vector

Contributor-level script execution via stored XSS

Published Sep 17, 2026 · Updated Sep 19, 2026

Stored cross-site scripting in PublishPress Series 3.1.3 and earlier allows remote authenticated users to execute scripts in another user's browser. Patchstack has not disclosed the affected input, rendering path, or missing output-encoding operation within the plugin. Contributor access is required to store the payload, and exploitation also requires a privileged user to interact with the affected content.

CVSS severity6.5
Medium
EPSS probability0.22%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in PublishPress Series 3.1.3 and earlier allows remote authenticated users to execute scripts in another user's browser. Patchstack has not disclosed the affected input, rendering path, or missing output-encoding operation within the plugin. Contributor access is required to store the payload, and exploitation also requires a privileged user to interact with the affected content.

The record

CVE
CVE-2026-66617
Published
Sep 17, 2026
Updated
Sep 19, 2026
Vendor
PublishPress
Product
PublishPress Series
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=n/a <=3.1.3 changes=[{"at":"3.1.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PublishPress · PublishPress Seriesversion=n/a <=3.1.3 changes=[{"at":"3.1.4","status":"unaffected"}]

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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