CVE-2026-110777
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.
CVSS
- Base score
- 5.7
- Version
- 3.1
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.39 %
- Percentile among all scored CVEs
- 32
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1203Exploitation for Client Executionexecution85 % - Primary impact
T1005Data from Local Systemcollection90 % - Secondary impact
T1567Exfiltration Over Web Serviceexfiltration55 %
El texto indica que un evento con URI file:// en ATTACH lee el fichero local, lo codifica en base64 y lo sube al servidor al guardar, tras interacción del usuario (UI:R).
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
ATT&CK mitigations that cover these techniques
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
CWEs
- CWE-200
References
Raw JSON (NVD)
Show
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"published": "2026-10-14T18:17:36.490",
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"lastModified": "2026-10-15T16:17:46.600",
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