---
id: CVE-2026-110777
title: A flaw was found in evolution-data-server
summary: >-
  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.…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
vendor: GNOME
product: evolution-data-server
affected:
  - evolution-data-server >= 3.26 < 3.62.1
  - evolution-data-server (all versions)
  - evolution-data-server
  - evolution-data-server (all versions)
  - evolution-data-server (all versions)
  - evolution-data-server (all versions)
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:17:46.600'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110777'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-110777'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552693'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/evolution-data-server/-/issues/672'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110777.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-110777'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110777'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T13:52:08.643454Z'
ingestedAt: '2026-10-14T18:47:39.313Z'
epss: 0.00381
epssPercentile: 0.32328
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110777.json)