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.
Published: 2026-10-14
Score: 5.7 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Advisories

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History

Thu, 15 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 14 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
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.
Title Evolution-data-server: local file disclosure via attach file:// uris
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-200
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'}


Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-15T15:06:53.883Z

Reserved: 2026-10-14T17:38:34.755Z

Link: CVE-2026-110777

cve-icon Vulnrichment

Updated: 2026-10-15T13:52:43.838Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T18:17:36.490

Modified: 2026-10-15T16:17:46.600

Link: CVE-2026-110777

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T00:00:00Z

Links: CVE-2026-110777 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T14:30:18Z

Weaknesses