CVE-2026-63266Hinoki check available

Arbitrary file write via embedded Firebird backup

Published Oct 5, 2026 · Updated Oct 5, 2026

Path traversal in The Document Foundation LibreOffice Calc 26.2 before 26.2.5 allows attackers to write files via a crafted spreadsheet. A saved SQL data link can open an embedded Firebird database whose backup functionality writes outside its private directory to a path selected by the document. The file must be opened in Calc, and the write is limited to locations writable by the LibreOffice user's account.

CVSS severity6.8
Medium
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Path traversal in The Document Foundation LibreOffice Calc 26.2 before 26.2.5 allows attackers to write files via a crafted spreadsheet. A saved SQL data link can open an embedded Firebird database whose backup functionality writes outside its private directory to a path selected by the document. The file must be opened in Calc, and the write is limited to locations writable by the LibreOffice user's account.

The record

CVE
CVE-2026-63266
Published
Oct 5, 2026
Updated
Oct 5, 2026
Vendor
The Document Foundation
Product
LibreOffice
Classifications
CWE-22, CAPEC-597, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=26.2 << 26.2.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Document Foundation · LibreOfficeversion=26.2 << 26.2.5

Published CVSS scores

6.8The Document FoundationCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-597Absolute Path Traversal
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

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