CVE-2026-110777 Evolution-data-server: local file disclosure via attach file:// uris
Attackers can exfiltrate arbitrary local files by embedding file:// URIs in malicious calendar events within shared CalDAV calendars.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110777?
CVE-2026-110777 is a medium-severity vulnerability in GNOME Red Hat Enterprise Linux 10, published on 14 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A flaw was found in evolution-data-server. Calendar events containing a file:// URI in their ATTACH property automatically read the targeted local file, base64-encode its contents and upload it back to the server when the event is saved. There are no file path restrictions or checks to verify whether the attachment originally came from the server or was added locally. This allows an attacker with access to a shared CalDAV calendar to exfiltrate arbitrary files the user has access to when interacting with malicious calendar events.
Weakness: CWE-200
Which versions are affected by CVE-2026-110777?
How do I fix CVE-2026-110777?
No fix has been published for CVE-2026-110777 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-110777 being exploited?
There is no known exploitation of CVE-2026-110777 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-110777, GHSA-vfc3-547x-wpx2, UBUNTU-CVE-2026-110777.