CVE-2026-21264
CVE-2026-21264 is a critical-severity vulnerability in Microsoft Account with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Critical (CVSS 3.x base score 9.3)
- EPSS exploit prediction: 0% (29th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-4507
- Weakness: CWE-79
- Affected product: Microsoft Account
- Published:
- Last modified:
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.
Frequently asked questions
- What is CVE-2026-21264?
- Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.
- How severe is CVE-2026-21264?
- CVE-2026-21264 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-21264 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-21264?
- CVE-2026-21264 affects Microsoft Account. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-21264?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-21264 have an EU (EUVD) identifier?
- Yes. CVE-2026-21264 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4507.
- When was CVE-2026-21264 published?
- CVE-2026-21264 was published on 2026-01-22 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:account:-:*:*:*:*:*:*:*
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- CVE-2025-21396 — High (CVSS 8.2): Missing authorization in Microsoft Account allows an unauthorized attacker to elevate privileges over a network.
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