CVE-2026-63509: Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network

This month

CRITICAL 9.9WATCHLISTMITIGATE

CVE-2026-63509 is a critical-severity flaw (CVSS 9.9) affecting fabric. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

Why this priority

Critical severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-23
Published	2026-08-20
Last modified	2026-10-18

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-20 22:17 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

microsoft fabric MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fabric || rpm -q fabric || fabric --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-63509?

fabric: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-63509 being exploited?

CVE-2026-63509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-63509 affect?

CVE-2026-63509 affects fabric. Severity is critical (CVSS 9.9). Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

How urgent is CVE-2026-63509?

Priority 55/100. Critical severity; On your watchlist

Related CVEs

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CVE-2026-69843 CRITICAL 10.0 MITIGATE Authentication bypass by spoofing in Microsoft Fabric allows an unauthorized attacker to elevate privileges ov
CVE-2026-70178 HIGH 8.5 MITIGATE Missing authorization in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

References

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