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CVE-2026-63266

Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality

6.8 MediumFix available

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.16%Unchanged since Oct 6, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.8

Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
CVE-2026-63266
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2026-92417 6.8

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
EUVD-2026-92417
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-5436-5r9x-m4jv 6.8

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the...

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
GHSA-5436-5r9x-m4jv
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-22
Updated
2026-11-02
NVD 6.8

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
CVE-2026-63266
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-22
Updated
2026-11-02
OSVDEBIAN-CVE-2026-63266 6.8

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
DEBIAN-CVE-2026-63266
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-63266 6.8

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

Record
UBUNTU-CVE-2026-63266
CVSS 4.0
6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVMGASA-2026-0514 No score

Updated libreoffice package fixes security vulnerabilities

Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality. (CVE-2026-63266) LFI and GET SSRF via calcext:data-mappings and csv provider. (CVE-2026-63267) LFI via calcext:data-mappings, sql provider and sdbc:flat:file:// db href. (CVE-2026-63268) LFI and GET SSRF via GStreamer and HLS playlists. (CVE-2026-63269) Environment/ini-file leaks. (CVE-2026-63270) Heap buffer overflow in WMF text record import. (CVE-2026-63272) Heap buffer overflow in PDF import encryption handling. (CVE-2026-63273) Heap buffer overflow in PDF import stream handling. (CVE-2026-63274) Stack buffer overflow in CFF font hint handling. (CVE-2026-63275) Stack buffer overflow in CFF to Type 1 font conversion. (CVE-2026-63276) RCE via calcext:data-mappings, sql provider and jdbc connector. (CVE-2026-63277) Package URLs can be used to exfiltrate arbitrary INI file values and environment variables. (CVE-2026-63278) Out of bounds read in PICT image import. (CVE-2026-63279)

Record
MGASA-2026-0514
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libreoffice
Debian:12
 All versions, plus listed versions
4:24.2.0-14:24.2.0-1~bpo12+14:24.2.0-24:24.2.0-34:24.2.0~alpha1-1
Show 45 moreShow less
4:24.2.0~beta1-14:24.2.0~rc1-14:24.2.0~rc1-24:24.2.0~rc2-14:24.2.0~rc2-24:24.2.0~rc2-2~bpo12+14:24.2.1-14:24.2.1-24:24.2.1-34:24.2.1-44:24.2.1~rc1-14:24.2.1~rc2-14:24.2.2-14:24.2.2-24:24.2.2-34:24.2.2~rc1-14:24.2.2~rc1-24:24.2.2~rc2-14:24.2.2~rc2-24:24.2.3-14:24.2.3-1~bpo12+14:24.2.3-24:24.2.3~rc1-14:24.2.3~rc1-24:24.2.3~rc1-34:24.2.3~rc2-14:24.2.4-14:24.2.4-1~bpo12+14:24.2.5-14:24.2.5-1~bpo12+14:24.2.5-24:24.2.5-34:24.2.5-44:24.2.6-14:24.2.6-24:24.2.6-2~bpo12+14:24.8.0~alpha1-14:24.8.0~alpha1-24:24.8.0~alpha1-34:24.8.0~alpha1-44:24.8.0~beta1-14:24.8.0~rc1-14:24.8.0~rc2-14:24.8.0~rc3-14:24.8.0~rc3-2
 None known
libreoffice
Debian:13
 before 4:25.2.3-2+deb13u8, plus listed versions
4:25.2.3-24:25.2.3-2+deb13u14:25.2.3-2+deb13u24:25.2.3-2+deb13u2~bpo12+14:25.2.3-2+deb13u3
Show 6 moreShow less
4:25.2.3-2+deb13u3~bpo12+14:25.2.3-2+deb13u44:25.2.3-2+deb13u54:25.2.3-2+deb13u5~bpo12+14:25.2.3-2+deb13u64:25.2.3-2+deb13u7
4:25.2.3-2+deb13u8
libreoffice
Debian:14
 before 4:26.2.5.2-1, plus listed versions
4:25.2.3-24:25.8.0-14:25.8.0-1~bpo13+14:25.8.0~alpha1-14:25.8.0~alpha1-2
Show 45 moreShow less
4:25.8.0~beta1-14:25.8.0~rc1-14:25.8.0~rc1-24:25.8.0~rc2-14:25.8.0~rc2-24:25.8.0~rc3-14:25.8.0~rc4-14:25.8.0~rc4-24:25.8.1-14:25.8.1-1~bpo13+14:25.8.1~rc1-14:25.8.2-14:25.8.2-24:25.8.2-34:25.8.2-3~bpo13+14:25.8.2~rc1-14:25.8.2~rc2-14:25.8.3-14:25.8.3-1+ports4:25.8.3-1~bpo13+14:25.8.3~rc1-14:25.8.3~rc2-14:25.8.4-14:25.8.4-1~bpo13+14:26.2.0-14:26.2.0-1~bpo13+14:26.2.0~alpha1-14:26.2.0~alpha1-24:26.2.0~alpha1-34:26.2.0~beta1-14:26.2.0~rc1-14:26.2.0~rc2-14:26.2.0~rc3-14:26.2.1-14:26.2.1-1~bpo13+14:26.2.1~rc1-14:26.2.1~rc2-14:26.2.2.1-14:26.2.2.1-24:26.2.2.2-14:26.2.2.2-24:26.2.2.2-34:26.2.2.2-3~bpo13+14:26.2.3.1-14:26.2.3.2-1
4:26.2.5.2-1
libreoffice
Mageia:10
From an advisory covering 13 CVEs
 before 26.2.6.3-1.mga10
26.2.6.3-1.mga10
libreoffice
Ubuntu:20.04:LTS
 All versions, plus listed versions
1:6.3.2-0ubuntu21:6.3.3-0ubuntu11:6.3.3-0ubuntu21:6.3.4-0ubuntu11:6.4.0-0ubuntu4
Show 24 moreShow less
1:6.4.0-0ubuntu61:6.4.0-0ubuntu71:6.4.1-0ubuntu11:6.4.2-0ubuntu11:6.4.2-0ubuntu21:6.4.2-0ubuntu31:6.4.3-0ubuntu0.20.04.11:6.4.4-0ubuntu0.20.04.11:6.4.5-0ubuntu0.20.04.11:6.4.6-0ubuntu0.20.04.11:6.4.7-0ubuntu0.20.04.11:6.4.7-0ubuntu0.20.04.21:6.4.7-0ubuntu0.20.04.41:6.4.7-0ubuntu0.20.04.51:6.4.7-0ubuntu0.20.04.61:6.4.7-0ubuntu0.20.04.71:6.4.7-0ubuntu0.20.04.81:6.4.7-0ubuntu0.20.04.91:6.4.7-0ubuntu0.20.04.101:6.4.7-0ubuntu0.20.04.111:6.4.7-0ubuntu0.20.04.121:6.4.7-0ubuntu0.20.04.131:6.4.7-0ubuntu0.20.04.141:6.4.7-0ubuntu0.20.04.15
 None known
libreoffice
Ubuntu:22.04:LTS
 All versions, plus listed versions
1:7.2.1-0ubuntu31:7.2.2-0ubuntu0.21.10.11:7.2.3~rc2-0ubuntu11:7.2.4-0ubuntu11:7.2.5~rc1-0ubuntu2
Show 25 moreShow less
1:7.2.5~rc2-0ubuntu11:7.3.1~rc2-0ubuntu11:7.3.1~rc3-0ubuntu11:7.3.2~rc1-0ubuntu21:7.3.2~rc2-0ubuntu11:7.3.2-0ubuntu11:7.3.2-0ubuntu21:7.3.3-0ubuntu0.22.04.11:7.3.4-0ubuntu0.22.04.11:7.3.5-0ubuntu0.22.04.11:7.3.6-0ubuntu0.22.04.11:7.3.6-0ubuntu0.22.04.21:7.3.7-0ubuntu0.22.04.11:7.3.7-0ubuntu0.22.04.21:7.3.7-0ubuntu0.22.04.31:7.3.7-0ubuntu0.22.04.41:7.3.7-0ubuntu0.22.04.51:7.3.7-0ubuntu0.22.04.61:7.3.7-0ubuntu0.22.04.71:7.3.7-0ubuntu0.22.04.81:7.3.7-0ubuntu0.22.04.91:7.3.7-0ubuntu0.22.04.101:7.3.7-0ubuntu0.22.04.111:7.3.7-0ubuntu0.22.04.121:7.3.7-0ubuntu0.22.04.13
 None known
libreoffice
Ubuntu:24.04:LTS
 All versions, plus listed versions
4:7.6.2-0ubuntu14:7.6.3~rc1-0ubuntu24:7.6.3-0ubuntu34:7.6.4-0ubuntu14:7.6.4-0ubuntu3
Show 19 moreShow less
4:24.2.0~rc1-0ubuntu14:24.2.1~rc1-0ubuntu14:24.2.1~rc2-0ubuntu14:24.2.2~rc2-0ubuntu14:24.2.2-0ubuntu14:24.2.3-0ubuntu0.24.04.14:24.2.3-0ubuntu0.24.04.24:24.2.4-0ubuntu0.24.04.14:24.2.4-0ubuntu0.24.04.24:24.2.5-0ubuntu0.24.04.14:24.2.5-0ubuntu0.24.04.24:24.2.6-0ubuntu0.24.04.14:24.2.7-0ubuntu0.24.04.14:24.2.7-0ubuntu0.24.04.24:24.2.7-0ubuntu0.24.04.34:24.2.7-0ubuntu0.24.04.44:24.2.7-0ubuntu0.24.04.54:24.2.7-0ubuntu0.24.04.64:24.2.7-0ubuntu0.24.04.7
 None known
libreoffice
Ubuntu:26.10
 All versions, plus listed versions
4:26.2.2.2-0ubuntu14:26.2.4.2-0ubuntu14:26.2.5.1-0ubuntu14:26.2.5.2-0ubuntu34:26.8.0.3-0ubuntu14:26.8.1.1-0ubuntu1
 None known
libreoffice
Ubuntu:26.04:LTS
 All versions, plus listed versions
4:25.8.1~rc1-0ubuntu14:25.8.3-0ubuntu14:25.8.4~rc1-0ubuntu24:25.8.4~rc1-0ubuntu34:25.8.4~rc2-0ubuntu1
Show 7 moreShow less
4:26.2.1~rc2-0ubuntu14:26.2.2.2-0ubuntu14:26.2.3.2-0ubuntu0.26.04.14:26.2.4.2-0ubuntu0.26.04.14:26.2.4.2-0ubuntu0.26.04.24:26.2.5.2-0ubuntu0.26.04.14:26.2.6.3-0ubuntu0.26.04.2
 None known

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-63266 is a medium vulnerability (CVSS 6.8) in The Document Foundation Libreoffice, published October 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 4th percentile. Fixed in libreoffice 4:25.2.3-2+deb13u8.

References

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Left out here: 206 versions. The JSON record has them.

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