Affects Microsoft SharePoint, a widely used enterprise product; vulnerability can impact many organizations and warrants broad IT notice.
CVE-2026-57105
Authenticated XSS in Microsoft SharePoint enabling script execution and spoofing.
Is CVE-2026-57105 being exploited?
Not confirmed. CVE-2026-57105 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. EPSS currently estimates a 0.58% probability of exploitation in the next 30 days.
How severe is CVE-2026-57105?
CVE-2026-57105 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-2026-57105?
Yes. A fix has been recorded for CVE-2026-57105. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57105 affect?
CVE-2026-57105 affects Microsoft SharePoint Server (on-premises), Microsoft SharePoint Online. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57105?
Apply vendor patch when released; restrict SharePoint access; review logs and sessions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can execute JavaScript in users' browsers to hijack sessions, steal credentials, perform actions as users, or deliver phishing.
Patch when possible
- affected>= 16.0.0 and < 16.0.10417.20198
- affected>= 16.0.0 and < 16.0.19725.20522
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.