CVE-2026-63266

MEDIUMPre-NVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (4th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
The EG Score, 6.8 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 5, 2026

Last Modified

October 6, 2026

Advisory Details (1)

Auto-updated Oct 5, 2026
Patch available.
Web page

Security advisories — LibreOffice

https://www.libreoffice.org/about-us/security/advisories/cve-2026-63266

Vendor Advisories for CVE-2026-63266(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libreoffice4:24.2.0-1 ... 4:7.6.4~rc1-1~bpo12+1 (250 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libreoffice4:25.2.3-2 ... 4:25.2.3-2+deb13u7 (11 versions)
  • every version up to 4:25.2.3-2+deb13u8: fixed in 4:25.2.3-2+deb13u8
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libreoffice4:25.2.3-2 ... 4:26.2.4.2-2 (56 versions)
  • every version up to 4:26.2.5.2-1: fixed in 4:26.2.5.2-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 30× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-12 15:49 UTCEG score recompute
  4. 2026-10-11 19:33 UTCEG score recompute
  5. 2026-10-11 18:34 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  6. 2026-10-11 16:48 UTCEG score recompute
  7. 2026-10-11 14:10 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-10 17:59 UTCEG score recompute
  11. 2026-10-10 17:59 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-10-09 17:24 UTCEG score recompute
  14. 2026-10-09 17:24 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-10-08 16:46 UTCEG score recompute
  17. 2026-10-08 16:46 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-10-07 16:03 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  20. 2026-10-06 15:24 UTCEG score recompute
  21. 2026-10-06 15:24 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-10-06 13:53 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  24. 2026-10-05 13:18 UTCEG score recompute
  25. 2026-10-05 13:18 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
Show 5 more
  1. 2026-10-05 13:02 UTCEG score recompute
  2. 2026-10-05 13:02 UTCGHSA enrichmentGHSA-5436-5r9x-m4jv
  3. 2026-10-05 12:31 UTCEG score recompute
  4. 2026-10-05 11:26 UTCEG score recomputeFirst assessed: 6.8 MEDIUM
  5. 2026-10-05 11:26 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-63266?
CVE-2026-63266 is a medium-severity vulnerability; its CVE record was published on October 5, 2026. 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…
When was CVE-2026-63266 made public?
CVE-2026-63266 was made public on October 5, 2026: that is the date its CVE record's CNA, Document Fdn., gives for when the vulnerability was made public. The CVE record itself was published on October 5, 2026. EchelonGraph's copy of the record carries a last-modified date of October 6, 2026; the record at its source may have been updated since.
Is CVE-2026-63266 actively exploited?
CVE-2026-63266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63266?
CVE-2026-63266 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63266?
A fix for CVE-2026-63266 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63266 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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