Affects Microsoft Exchange Server, a core enterprise mail platform; XSS could enable spoofing and phishing across orgs.
CVE-2026-47631
XSS in Exchange Server enables spoofing via crafted input.
Is CVE-2026-47631 being exploited?
Not confirmed. CVE-2026-47631 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-47631?
CVE-2026-47631 is rated High with a CVSS score of 8.1. 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-2026-47631?
Yes. A fix has been recorded for CVE-2026-47631. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47631 affect?
CVE-2026-47631 affects Microsoft Exchange Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47631?
Patch when available; tighten input validation; enable WAF.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can run scripts in victims' browsers through Exchange web pages, enabling spoofed content and data exposure.
Patch when possible
- affected>= 15.01.0.0 and < 15.01.2507.071
- affected>= 15.02.0.0 and < 15.02.1544.043
- affected>= 15.02.0.0 and < 15.02.1748.048
- affected>= 15.02.0.0 and < 15.02.2562.045
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.