CVE-2026-1043Network attack vector

Administrator-level stored XSS via unescaped settings values

Published Feb 19, 2026 · Updated Feb 19, 2026

Stored XSS in Gagan Deep Singh PostmarkApp Email Integrator 2.4 and earlier allows remote authenticated users to inject scripts via plugin settings. The settings handler stores pma_api_key and pma_sender_address without adequate sanitization, and the settings page renders them without output escaping. Administrator-level access is required; the script executes for anyone opening that page, enabling actions or data access within that viewer's WordPress session.

CVSS severity4.4
Medium
EPSS probability0.24%
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 Gagan Deep Singh PostmarkApp Email Integrator 2.4 and earlier allows remote authenticated users to inject scripts via plugin settings. The settings handler stores pma_api_key and pma_sender_address without adequate sanitization, and the settings page renders them without output escaping. Administrator-level access is required; the script executes for anyone opening that page, enabling actions or data access within that viewer's WordPress session.

The record

CVE
CVE-2026-1043
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Gagan Deep Singh
Product
PostmarkApp Email Integrator
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 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=* <=2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Gagan Deep Singh · PostmarkApp Email Integratorversion=* <=2.4

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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