Vulnerability-Lookup

UBUNTU-CVE-2026-110777 (CVE-2026-110777)

Vulnerability from osv_ubuntu – Published: 2026-10-14 18:17 – Updated: 2026-10-28 17:50 – Source website

Details

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.

Severity

5.7 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-110777	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-110777	REPORT
	https://access.redhat.com/security/cve/CVE-2026-110777	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2552693	REPORT
	https://gitlab.gnome.org/GNOME/evolution-data-ser…	REPORT

JSON

To clipboard

{
  "affected": [
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      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "evolution-data-server",
            "binary_version": "3.18.5-1ubuntu1.3"
          },
          {
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            "binary_version": "3.18.5-1ubuntu1.3"
          },
          {
            "binary_name": "evolution-data-server-online-accounts",
            "binary_version": "3.18.5-1ubuntu1.3"
          },
          {
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          },
          {
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          },
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          },
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          },
          {
            "binary_name": "libebackend-1.2-10",
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          },
          {
            "binary_name": "libebook-1.2-16",
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          },
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        "3.56.2-6",
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  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-110777",
  "modified": "2026-10-28T17:50:34Z",
  "published": "2026-10-14T18:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-110777"
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  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-110777"
  ]
}

CVE-2026-110777 (GCVE-0-2026-110777)

Vulnerability from cvelistv5 – Published: 2026-10-14 18:08 – Updated: 2026-10-16 09:47

Title

Evolution-data-server: local file disclosure via attach file:// uris

Summary

Severity

5.7 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 13:52 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1063 records in the last 180 days details

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-110777	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2552693	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/evolution-data-ser…

Impacted products

6 products

Vendor	Product	Version
GNOME	evolution-data-server	Affected: 3.26 , < 3.62.1 (semver)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-10-08 00:00

Credits

Red Hat would like to thank Giuseppe Lobraico (Perspican) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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