CVE-2026-26930 Cross-site scripting in SmarterMail
Attackers can execute arbitrary scripts in user browsers via MAPI requests in SmarterMail, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26930?
CVE-2026-26930 is a high-severity cross-site scripting vulnerability in SmarterTools SmarterMail, published on 16 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SmarterTools SmarterMail before 9526 allows XSS via MAPI requests.
Weakness: CWE-79
Which versions are affected by CVE-2026-26930?
How do I fix CVE-2026-26930?
No fix has been published for CVE-2026-26930 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26930 being exploited?
There is no known exploitation of CVE-2026-26930 in the wild and no public exploit code.
Sources
Also known as GHSA-5rm3-93cg-6rcr.