Vulnerability Details CVE-2026-25529
Postal is an open source SMTP server. Postal versions less than 3.3.5 had a HTML injection vulnerability that allowed unescaped data to be included in the admin interface. The primary way for unescaped data to be added is via the API's "send/raw" method. This could allow arbitrary HTML to be injected in to the page which may modify the page in a misleading way or allow for unauthorised javascript to be executed. Fixed in 3.3.5 and higher.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.2%
CVSS Severity
CVSS v3 Score 8.1
Products affected by CVE-2026-25529
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cpe:2.3:a:postalserver:postal:-
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cpe:2.3:a:postalserver:postal:2.0.0
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cpe:2.3:a:postalserver:postal:2.1.0
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cpe:2.3:a:postalserver:postal:2.1.1
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cpe:2.3:a:postalserver:postal:2.1.2
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cpe:2.3:a:postalserver:postal:2.1.3
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cpe:2.3:a:postalserver:postal:2.1.4
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cpe:2.3:a:postalserver:postal:2.1.5
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cpe:2.3:a:postalserver:postal:2.1.6
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cpe:2.3:a:postalserver:postal:2.2.0
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cpe:2.3:a:postalserver:postal:2.2.1
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cpe:2.3:a:postalserver:postal:2.2.2
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cpe:2.3:a:postalserver:postal:2.3.0
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cpe:2.3:a:postalserver:postal:2.3.1
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cpe:2.3:a:postalserver:postal:2.3.2
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cpe:2.3:a:postalserver:postal:3.0.0
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cpe:2.3:a:postalserver:postal:3.0.1
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cpe:2.3:a:postalserver:postal:3.0.2
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cpe:2.3:a:postalserver:postal:3.1.0
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cpe:2.3:a:postalserver:postal:3.1.1
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cpe:2.3:a:postalserver:postal:3.2.0
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cpe:2.3:a:postalserver:postal:3.2.1
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cpe:2.3:a:postalserver:postal:3.2.2
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cpe:2.3:a:postalserver:postal:3.3.0
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cpe:2.3:a:postalserver:postal:3.3.1
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cpe:2.3:a:postalserver:postal:3.3.2
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cpe:2.3:a:postalserver:postal:3.3.3
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cpe:2.3:a:postalserver:postal:3.3.4