Shodan
Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-23845

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.6%
CVSS Severity
CVSS v3 Score 5.8
Products affected by CVE-2026-23845
  • Axllent » Mailpit » Version: 0.0.1
    cpe:2.3:a:axllent:mailpit:0.0.1
  • Axllent » Mailpit » Version: 0.0.2
    cpe:2.3:a:axllent:mailpit:0.0.2
  • Axllent » Mailpit » Version: 0.0.3
    cpe:2.3:a:axllent:mailpit:0.0.3
  • Axllent » Mailpit » Version: 0.0.4
    cpe:2.3:a:axllent:mailpit:0.0.4
  • Axllent » Mailpit » Version: 0.0.5
    cpe:2.3:a:axllent:mailpit:0.0.5
  • Axllent » Mailpit » Version: 0.0.6
    cpe:2.3:a:axllent:mailpit:0.0.6
  • Axllent » Mailpit » Version: 0.0.7
    cpe:2.3:a:axllent:mailpit:0.0.7
  • Axllent » Mailpit » Version: 0.0.8
    cpe:2.3:a:axllent:mailpit:0.0.8
  • Axllent » Mailpit » Version: 0.0.9
    cpe:2.3:a:axllent:mailpit:0.0.9
  • Axllent » Mailpit » Version: 0.1.0
    cpe:2.3:a:axllent:mailpit:0.1.0
  • Axllent » Mailpit » Version: 0.1.1
    cpe:2.3:a:axllent:mailpit:0.1.1
  • Axllent » Mailpit » Version: 0.1.2
    cpe:2.3:a:axllent:mailpit:0.1.2
  • Axllent » Mailpit » Version: 0.1.3
    cpe:2.3:a:axllent:mailpit:0.1.3
  • Axllent » Mailpit » Version: 0.1.4
    cpe:2.3:a:axllent:mailpit:0.1.4
  • Axllent » Mailpit » Version: 0.1.5
    cpe:2.3:a:axllent:mailpit:0.1.5
  • Axllent » Mailpit » Version: 1.0.0
    cpe:2.3:a:axllent:mailpit:1.0.0
  • Axllent » Mailpit » Version: 1.1.0
    cpe:2.3:a:axllent:mailpit:1.1.0
  • Axllent » Mailpit » Version: 1.1.1
    cpe:2.3:a:axllent:mailpit:1.1.1
  • Axllent » Mailpit » Version: 1.1.2
    cpe:2.3:a:axllent:mailpit:1.1.2
  • Axllent » Mailpit » Version: 1.1.3
    cpe:2.3:a:axllent:mailpit:1.1.3
  • Axllent » Mailpit » Version: 1.1.4
    cpe:2.3:a:axllent:mailpit:1.1.4
  • Axllent » Mailpit » Version: 1.1.5
    cpe:2.3:a:axllent:mailpit:1.1.5
  • Axllent » Mailpit » Version: 1.1.6
    cpe:2.3:a:axllent:mailpit:1.1.6
  • Axllent » Mailpit » Version: 1.1.7
    cpe:2.3:a:axllent:mailpit:1.1.7
  • Axllent » Mailpit » Version: 1.10.0
    cpe:2.3:a:axllent:mailpit:1.10.0
  • Axllent » Mailpit » Version: 1.10.1
    cpe:2.3:a:axllent:mailpit:1.10.1
  • Axllent » Mailpit » Version: 1.10.2
    cpe:2.3:a:axllent:mailpit:1.10.2
  • Axllent » Mailpit » Version: 1.10.3
    cpe:2.3:a:axllent:mailpit:1.10.3
  • Axllent » Mailpit » Version: 1.10.4
    cpe:2.3:a:axllent:mailpit:1.10.4
  • Axllent » Mailpit » Version: 1.11.0
    cpe:2.3:a:axllent:mailpit:1.11.0
  • Axllent » Mailpit » Version: 1.11.1
    cpe:2.3:a:axllent:mailpit:1.11.1
  • Axllent » Mailpit » Version: 1.12.0
    cpe:2.3:a:axllent:mailpit:1.12.0
  • Axllent » Mailpit » Version: 1.12.1
    cpe:2.3:a:axllent:mailpit:1.12.1
  • Axllent » Mailpit » Version: 1.13.0
    cpe:2.3:a:axllent:mailpit:1.13.0
  • Axllent » Mailpit » Version: 1.13.1
    cpe:2.3:a:axllent:mailpit:1.13.1
  • Axllent » Mailpit » Version: 1.13.2
    cpe:2.3:a:axllent:mailpit:1.13.2
  • Axllent » Mailpit » Version: 1.13.3
    cpe:2.3:a:axllent:mailpit:1.13.3
  • Axllent » Mailpit » Version: 1.14.0
    cpe:2.3:a:axllent:mailpit:1.14.0
  • Axllent » Mailpit » Version: 1.14.1
    cpe:2.3:a:axllent:mailpit:1.14.1
  • Axllent » Mailpit » Version: 1.14.2
    cpe:2.3:a:axllent:mailpit:1.14.2
  • Axllent » Mailpit » Version: 1.14.3
    cpe:2.3:a:axllent:mailpit:1.14.3
  • Axllent » Mailpit » Version: 1.14.4
    cpe:2.3:a:axllent:mailpit:1.14.4
  • Axllent » Mailpit » Version: 1.15.0
    cpe:2.3:a:axllent:mailpit:1.15.0
  • Axllent » Mailpit » Version: 1.15.1
    cpe:2.3:a:axllent:mailpit:1.15.1
  • Axllent » Mailpit » Version: 1.16.0
    cpe:2.3:a:axllent:mailpit:1.16.0
  • Axllent » Mailpit » Version: 1.17.0
    cpe:2.3:a:axllent:mailpit:1.17.0
  • Axllent » Mailpit » Version: 1.17.1
    cpe:2.3:a:axllent:mailpit:1.17.1
  • Axllent » Mailpit » Version: 1.18.0
    cpe:2.3:a:axllent:mailpit:1.18.0
  • Axllent » Mailpit » Version: 1.18.1
    cpe:2.3:a:axllent:mailpit:1.18.1
  • Axllent » Mailpit » Version: 1.18.2
    cpe:2.3:a:axllent:mailpit:1.18.2
  • Axllent » Mailpit » Version: 1.18.3
    cpe:2.3:a:axllent:mailpit:1.18.3
  • Axllent » Mailpit » Version: 1.18.4
    cpe:2.3:a:axllent:mailpit:1.18.4
  • Axllent » Mailpit » Version: 1.18.5
    cpe:2.3:a:axllent:mailpit:1.18.5
  • Axllent » Mailpit » Version: 1.18.6
    cpe:2.3:a:axllent:mailpit:1.18.6
  • Axllent » Mailpit » Version: 1.18.7
    cpe:2.3:a:axllent:mailpit:1.18.7
  • Axllent » Mailpit » Version: 1.19.0
    cpe:2.3:a:axllent:mailpit:1.19.0
  • Axllent » Mailpit » Version: 1.19.1
    cpe:2.3:a:axllent:mailpit:1.19.1
  • Axllent » Mailpit » Version: 1.19.2
    cpe:2.3:a:axllent:mailpit:1.19.2
  • Axllent » Mailpit » Version: 1.19.3
    cpe:2.3:a:axllent:mailpit:1.19.3
  • Axllent » Mailpit » Version: 1.2.0
    cpe:2.3:a:axllent:mailpit:1.2.0
  • Axllent » Mailpit » Version: 1.2.1
    cpe:2.3:a:axllent:mailpit:1.2.1
  • Axllent » Mailpit » Version: 1.2.2
    cpe:2.3:a:axllent:mailpit:1.2.2
  • Axllent » Mailpit » Version: 1.2.3
    cpe:2.3:a:axllent:mailpit:1.2.3
  • Axllent » Mailpit » Version: 1.2.4
    cpe:2.3:a:axllent:mailpit:1.2.4
  • Axllent » Mailpit » Version: 1.2.5
    cpe:2.3:a:axllent:mailpit:1.2.5
  • Axllent » Mailpit » Version: 1.2.6
    cpe:2.3:a:axllent:mailpit:1.2.6
  • Axllent » Mailpit » Version: 1.2.7
    cpe:2.3:a:axllent:mailpit:1.2.7
  • Axllent » Mailpit » Version: 1.2.8
    cpe:2.3:a:axllent:mailpit:1.2.8
  • Axllent » Mailpit » Version: 1.2.9
    cpe:2.3:a:axllent:mailpit:1.2.9
  • Axllent » Mailpit » Version: 1.20.0
    cpe:2.3:a:axllent:mailpit:1.20.0
  • Axllent » Mailpit » Version: 1.20.1
    cpe:2.3:a:axllent:mailpit:1.20.1
  • Axllent » Mailpit » Version: 1.20.2
    cpe:2.3:a:axllent:mailpit:1.20.2
  • Axllent » Mailpit » Version: 1.20.3
    cpe:2.3:a:axllent:mailpit:1.20.3
  • Axllent » Mailpit » Version: 1.20.4
    cpe:2.3:a:axllent:mailpit:1.20.4
  • Axllent » Mailpit » Version: 1.20.5
    cpe:2.3:a:axllent:mailpit:1.20.5
  • Axllent » Mailpit » Version: 1.20.6
    cpe:2.3:a:axllent:mailpit:1.20.6
  • Axllent » Mailpit » Version: 1.20.7
    cpe:2.3:a:axllent:mailpit:1.20.7
  • Axllent » Mailpit » Version: 1.21.0
    cpe:2.3:a:axllent:mailpit:1.21.0
  • Axllent » Mailpit » Version: 1.21.1
    cpe:2.3:a:axllent:mailpit:1.21.1
  • Axllent » Mailpit » Version: 1.21.2
    cpe:2.3:a:axllent:mailpit:1.21.2
  • Axllent » Mailpit » Version: 1.21.3
    cpe:2.3:a:axllent:mailpit:1.21.3
  • Axllent » Mailpit » Version: 1.21.4
    cpe:2.3:a:axllent:mailpit:1.21.4
  • Axllent » Mailpit » Version: 1.21.5
    cpe:2.3:a:axllent:mailpit:1.21.5
  • Axllent » Mailpit » Version: 1.21.6
    cpe:2.3:a:axllent:mailpit:1.21.6
  • Axllent » Mailpit » Version: 1.21.7
    cpe:2.3:a:axllent:mailpit:1.21.7
  • Axllent » Mailpit » Version: 1.21.8
    cpe:2.3:a:axllent:mailpit:1.21.8
  • Axllent » Mailpit » Version: 1.22.0
    cpe:2.3:a:axllent:mailpit:1.22.0
  • Axllent » Mailpit » Version: 1.22.1
    cpe:2.3:a:axllent:mailpit:1.22.1
  • Axllent » Mailpit » Version: 1.22.2
    cpe:2.3:a:axllent:mailpit:1.22.2
  • Axllent » Mailpit » Version: 1.22.3
    cpe:2.3:a:axllent:mailpit:1.22.3
  • Axllent » Mailpit » Version: 1.23.0
    cpe:2.3:a:axllent:mailpit:1.23.0
  • Axllent » Mailpit » Version: 1.23.1
    cpe:2.3:a:axllent:mailpit:1.23.1
  • Axllent » Mailpit » Version: 1.23.2
    cpe:2.3:a:axllent:mailpit:1.23.2
  • Axllent » Mailpit » Version: 1.24.0
    cpe:2.3:a:axllent:mailpit:1.24.0
  • Axllent » Mailpit » Version: 1.24.1
    cpe:2.3:a:axllent:mailpit:1.24.1
  • Axllent » Mailpit » Version: 1.24.2
    cpe:2.3:a:axllent:mailpit:1.24.2
  • Axllent » Mailpit » Version: 1.25.0
    cpe:2.3:a:axllent:mailpit:1.25.0
  • Axllent » Mailpit » Version: 1.25.1
    cpe:2.3:a:axllent:mailpit:1.25.1
  • Axllent » Mailpit » Version: 1.26.0
    cpe:2.3:a:axllent:mailpit:1.26.0
  • Axllent » Mailpit » Version: 1.26.1
    cpe:2.3:a:axllent:mailpit:1.26.1
  • Axllent » Mailpit » Version: 1.26.2
    cpe:2.3:a:axllent:mailpit:1.26.2
  • Axllent » Mailpit » Version: 1.27.0
    cpe:2.3:a:axllent:mailpit:1.27.0
  • Axllent » Mailpit » Version: 1.27.1
    cpe:2.3:a:axllent:mailpit:1.27.1
  • Axllent » Mailpit » Version: 1.27.10
    cpe:2.3:a:axllent:mailpit:1.27.10
  • Axllent » Mailpit » Version: 1.27.11
    cpe:2.3:a:axllent:mailpit:1.27.11
  • Axllent » Mailpit » Version: 1.27.2
    cpe:2.3:a:axllent:mailpit:1.27.2
  • Axllent » Mailpit » Version: 1.27.3
    cpe:2.3:a:axllent:mailpit:1.27.3
  • Axllent » Mailpit » Version: 1.27.4
    cpe:2.3:a:axllent:mailpit:1.27.4
  • Axllent » Mailpit » Version: 1.27.5
    cpe:2.3:a:axllent:mailpit:1.27.5
  • Axllent » Mailpit » Version: 1.27.6
    cpe:2.3:a:axllent:mailpit:1.27.6
  • Axllent » Mailpit » Version: 1.27.7
    cpe:2.3:a:axllent:mailpit:1.27.7
  • Axllent » Mailpit » Version: 1.27.8
    cpe:2.3:a:axllent:mailpit:1.27.8
  • Axllent » Mailpit » Version: 1.27.9
    cpe:2.3:a:axllent:mailpit:1.27.9
  • Axllent » Mailpit » Version: 1.28.0
    cpe:2.3:a:axllent:mailpit:1.28.0
  • Axllent » Mailpit » Version: 1.28.1
    cpe:2.3:a:axllent:mailpit:1.28.1
  • Axllent » Mailpit » Version: 1.28.2
    cpe:2.3:a:axllent:mailpit:1.28.2
  • Axllent » Mailpit » Version: 1.3.0
    cpe:2.3:a:axllent:mailpit:1.3.0
  • Axllent » Mailpit » Version: 1.3.1
    cpe:2.3:a:axllent:mailpit:1.3.1
  • Axllent » Mailpit » Version: 1.3.10
    cpe:2.3:a:axllent:mailpit:1.3.10
  • Axllent » Mailpit » Version: 1.3.11
    cpe:2.3:a:axllent:mailpit:1.3.11
  • Axllent » Mailpit » Version: 1.3.2
    cpe:2.3:a:axllent:mailpit:1.3.2
  • Axllent » Mailpit » Version: 1.3.3
    cpe:2.3:a:axllent:mailpit:1.3.3
  • Axllent » Mailpit » Version: 1.3.4
    cpe:2.3:a:axllent:mailpit:1.3.4
  • Axllent » Mailpit » Version: 1.3.5
    cpe:2.3:a:axllent:mailpit:1.3.5
  • Axllent » Mailpit » Version: 1.3.6
    cpe:2.3:a:axllent:mailpit:1.3.6
  • Axllent » Mailpit » Version: 1.3.7
    cpe:2.3:a:axllent:mailpit:1.3.7
  • Axllent » Mailpit » Version: 1.3.8
    cpe:2.3:a:axllent:mailpit:1.3.8
  • Axllent » Mailpit » Version: 1.3.9
    cpe:2.3:a:axllent:mailpit:1.3.9
  • Axllent » Mailpit » Version: 1.4.0
    cpe:2.3:a:axllent:mailpit:1.4.0
  • Axllent » Mailpit » Version: 1.5.0
    cpe:2.3:a:axllent:mailpit:1.5.0
  • Axllent » Mailpit » Version: 1.5.1
    cpe:2.3:a:axllent:mailpit:1.5.1
  • Axllent » Mailpit » Version: 1.5.2
    cpe:2.3:a:axllent:mailpit:1.5.2
  • Axllent » Mailpit » Version: 1.5.3
    cpe:2.3:a:axllent:mailpit:1.5.3
  • Axllent » Mailpit » Version: 1.5.4
    cpe:2.3:a:axllent:mailpit:1.5.4
  • Axllent » Mailpit » Version: 1.5.5
    cpe:2.3:a:axllent:mailpit:1.5.5
  • Axllent » Mailpit » Version: 1.6.0
    cpe:2.3:a:axllent:mailpit:1.6.0
  • Axllent » Mailpit » Version: 1.6.1
    cpe:2.3:a:axllent:mailpit:1.6.1
  • Axllent » Mailpit » Version: 1.6.10
    cpe:2.3:a:axllent:mailpit:1.6.10
  • Axllent » Mailpit » Version: 1.6.11
    cpe:2.3:a:axllent:mailpit:1.6.11
  • Axllent » Mailpit » Version: 1.6.12
    cpe:2.3:a:axllent:mailpit:1.6.12
  • Axllent » Mailpit » Version: 1.6.13
    cpe:2.3:a:axllent:mailpit:1.6.13
  • Axllent » Mailpit » Version: 1.6.14
    cpe:2.3:a:axllent:mailpit:1.6.14
  • Axllent » Mailpit » Version: 1.6.15
    cpe:2.3:a:axllent:mailpit:1.6.15
  • Axllent » Mailpit » Version: 1.6.16
    cpe:2.3:a:axllent:mailpit:1.6.16
  • Axllent » Mailpit » Version: 1.6.17
    cpe:2.3:a:axllent:mailpit:1.6.17
  • Axllent » Mailpit » Version: 1.6.18
    cpe:2.3:a:axllent:mailpit:1.6.18
  • Axllent » Mailpit » Version: 1.6.19
    cpe:2.3:a:axllent:mailpit:1.6.19
  • Axllent » Mailpit » Version: 1.6.2
    cpe:2.3:a:axllent:mailpit:1.6.2
  • Axllent » Mailpit » Version: 1.6.20
    cpe:2.3:a:axllent:mailpit:1.6.20
  • Axllent » Mailpit » Version: 1.6.21
    cpe:2.3:a:axllent:mailpit:1.6.21
  • Axllent » Mailpit » Version: 1.6.22
    cpe:2.3:a:axllent:mailpit:1.6.22
  • Axllent » Mailpit » Version: 1.6.3
    cpe:2.3:a:axllent:mailpit:1.6.3
  • Axllent » Mailpit » Version: 1.6.4
    cpe:2.3:a:axllent:mailpit:1.6.4
  • Axllent » Mailpit » Version: 1.6.5
    cpe:2.3:a:axllent:mailpit:1.6.5
  • Axllent » Mailpit » Version: 1.6.6
    cpe:2.3:a:axllent:mailpit:1.6.6
  • Axllent » Mailpit » Version: 1.6.7
    cpe:2.3:a:axllent:mailpit:1.6.7
  • Axllent » Mailpit » Version: 1.6.8
    cpe:2.3:a:axllent:mailpit:1.6.8
  • Axllent » Mailpit » Version: 1.6.9
    cpe:2.3:a:axllent:mailpit:1.6.9
  • Axllent » Mailpit » Version: 1.7.0
    cpe:2.3:a:axllent:mailpit:1.7.0
  • Axllent » Mailpit » Version: 1.7.1
    cpe:2.3:a:axllent:mailpit:1.7.1
  • Axllent » Mailpit » Version: 1.8.0
    cpe:2.3:a:axllent:mailpit:1.8.0
  • Axllent » Mailpit » Version: 1.8.1
    cpe:2.3:a:axllent:mailpit:1.8.1
  • Axllent » Mailpit » Version: 1.8.2
    cpe:2.3:a:axllent:mailpit:1.8.2
  • Axllent » Mailpit » Version: 1.8.3
    cpe:2.3:a:axllent:mailpit:1.8.3
  • Axllent » Mailpit » Version: 1.8.4
    cpe:2.3:a:axllent:mailpit:1.8.4
  • Axllent » Mailpit » Version: 1.9.0
    cpe:2.3:a:axllent:mailpit:1.9.0
  • Axllent » Mailpit » Version: 1.9.1
    cpe:2.3:a:axllent:mailpit:1.9.1
  • Axllent » Mailpit » Version: 1.9.10
    cpe:2.3:a:axllent:mailpit:1.9.10
  • Axllent » Mailpit » Version: 1.9.2
    cpe:2.3:a:axllent:mailpit:1.9.2
  • Axllent » Mailpit » Version: 1.9.3
    cpe:2.3:a:axllent:mailpit:1.9.3
  • Axllent » Mailpit » Version: 1.9.4
    cpe:2.3:a:axllent:mailpit:1.9.4
  • Axllent » Mailpit » Version: 1.9.5
    cpe:2.3:a:axllent:mailpit:1.9.5
  • Axllent » Mailpit » Version: 1.9.6
    cpe:2.3:a:axllent:mailpit:1.9.6
  • Axllent » Mailpit » Version: 1.9.7
    cpe:2.3:a:axllent:mailpit:1.9.7
  • Axllent » Mailpit » Version: 1.9.8
    cpe:2.3:a:axllent:mailpit:1.9.8
  • Axllent » Mailpit » Version: 1.9.9
    cpe:2.3:a:axllent:mailpit:1.9.9


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