CVE-2020-27509

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-06-26 · updated 2026-07-09
Weakness: CWE-79

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.

Affected products

Galaxkey: before 5.6.11.5 — fixed in 5.6.11.5

How to fix

Upgrade to a fixed version: Galaxkey 5.6.11.5. Check the vendor advisory for mitigations.

References

https://medium.com/@tomhulme_74888/persistent-cross-site-scripting-leading-to-full-account-takeover-on-galaxkey-v5-6-11-4-8bf96be35b54
https://medium.com/%40tomhulme_74888/persistent-cross-site-scripting-leading-to-full-account-takeover-on-galaxkey-v5-6-11-4-8bf96be35b54

Get alerted when CVE-2020-27509 or the next vulnerability affects your stack