CVE-2026-1266Network attack vector

Stored XSS via unescaped administrative settings

Published Jan 24, 2026 · Updated Jan 24, 2026

Stored XSS in Postalicious 3.0.1 and earlier allows remote authenticated users to inject scripts through administrative settings. The plugin stores administrator-supplied setting values without sufficient sanitization and renders them without context-appropriate output escaping, causing saved scripts to execute when an affected page is opened. Exploitation requires administrator privileges and affects only multisite installations or sites where unfiltered_html is disabled; scripts run in the affected site's origin.

CVSS severity4.4
Medium
EPSS probability0.26%
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 Postalicious 3.0.1 and earlier allows remote authenticated users to inject scripts through administrative settings. The plugin stores administrator-supplied setting values without sufficient sanitization and renders them without context-appropriate output escaping, causing saved scripts to execute when an affected page is opened. Exploitation requires administrator privileges and affects only multisite installations or sites where unfiltered_html is disabled; scripts run in the affected site's origin.

The record

CVE
CVE-2026-1266
Published
Jan 24, 2026
Updated
Jan 24, 2026
Vendor
neop
Product
Postalicious
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 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=* <=3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

neop · Postaliciousversion=* <=3.0.1

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

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