CVE-2026-5158Public exploitNetwork attack vector

Stored XSS via unescaped comment placeholder attribute

Published Aug 6, 2026 · Updated Aug 6, 2026

Stored XSS in WPXPO PostX 5.0.13 and earlier allows remote authenticated users to execute scripts through the Post Comments Block. The block stores the inputPlaceHolder value in post content and renders it into an HTML placeholder attribute without sufficient sanitization or output escaping. Contributor-level access is required to inject the payload, which runs in a page viewer's browser context when the affected page is opened.

CVSS severity6.4
Medium
EPSS probability0.15%
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 WPXPO PostX 5.0.13 and earlier allows remote authenticated users to execute scripts through the Post Comments Block. The block stores the inputPlaceHolder value in post content and renders it into an HTML placeholder attribute without sufficient sanitization or output escaping. Contributor-level access is required to inject the payload, which runs in a page viewer's browser context when the affected page is opened.

The record

CVE
CVE-2026-5158
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
WPXPO
Product
PostX
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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 <=5.0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPXPO · PostXversion=0 <=5.0.13

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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