Applications
CVE-2026-109466
Authenticated adjacent attacker can escalate privileges in Microsoft SharePoint.
Major vulnerability. Affects Microsoft SharePoint, a widely used enterprise collaboration platform; exploitable privilege escalation could disrupt many organizations.
- CVSS
- 8.0Highscored by the publisher (CNA)
- Exploited in the wild
- Not knownnot in CISA KEV as of our last sync
- EPSS
- No score yet
- Fix
- Patch availablesee the advisories in the references
- Published
- 10 Nov 2026analysed here 12 Nov 2026
Summary
Impact
Authenticated adjacent attacker can elevate privileges to admin-level in SharePoint, enabling content modification, account takeover, or lateral access.
Triage
The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.
Affected products
| Product | Affected versions | Vendor says fixed in |
|---|---|---|
| Microsoft Microsoft SharePoint Server Subscription Edition | >= 16.0.0 and < 16.0.20326.20278Vendor says fixed in: not stated |
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
Products named in our analysis
- Microsoft Office SharePoint
- Microsoft SharePoint Server
Fix and mitigation
Action required
Patch when possible
WAF and other mitigations
Can a WAF block it? No. An authorization check is missing. The attacker sends ordinary-looking requests for things they should not reach, so a WAF has nothing to match on.
Also consider: patch
Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Remediation steps (AI-written)
Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.
Exploitation evidence
- CISA KEV catalog
- Not listed as of our last sync.
- Public exploit code
- None on record in Exploit-DB, Metasploit, Nuclei templates or PoC-in-GitHub.
- CISA SSVC
- exploitation none, automatable no, technical impact totalAssessed by CISA 10 Nov 2026 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.
Timeline
- 10 Nov 2026Published
- 10 Nov 2026CISA SSVC assessment: exploitation nonesame day later
- 12 Nov 2026CVE record last updated2 days later
- 12 Nov 2026Analysed by vulneraibility.comsame day later
Common questions
Is CVE-2026-109466 being exploited?
Not confirmed. CVE-2026-109466 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-109466?
CVE-2026-109466 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-109466?
Yes. A fix has been recorded for CVE-2026-109466. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-109466 affect?
CVE-2026-109466 affects Microsoft Office SharePoint, Microsoft SharePoint Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-109466?
Apply Microsoft's security update immediately; restrict SharePoint access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
References
1 reference in the CVE record, grouped by the tags the record gives them.
Patches (1)
- msrc.microsoft.com /update-guide/vulnerability/CVE-2026-109466
Where the data on this page comes from
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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