CVE-2026-21264: Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allo

This month

CRITICAL 9.3WATCHLISTMITIGATE

CVE-2026-21264 is a critical-severity flaw (CVSS 9.3) affecting account. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing 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	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-22
Last modified	2026-06-17

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-22 23:15 UTCPublished CVE record published
2026-06-17 10:18 UTCUpdated Record last modified

microsoft account 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 account || rpm -q account || account --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-2026-21264?

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

Is CVE-2026-21264 being exploited?

CVE-2026-21264 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-2026-21264 affect?

CVE-2026-21264 affects account. Severity is critical (CVSS 9.3). 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 urgent is CVE-2026-21264?

Priority 46/100. Critical severity; On your watchlist

Related CVEs

CVE-2026-56165 CRITICAL 9.8 MITIGATE Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network
CVE-2025-21076 MEDIUM 5.5 UPGRADE Improper handling of insufficient permissions or privileges in Samsung Account prior to version 15.5.00.18 all
CVE-2025-58486 MEDIUM 4.0 UPGRADE Improper input validation in Samsung Account prior to version 15.5.01.1 allows local attacker to execute arbit
CVE-2026-20994 MEDIUM 6.1 UPGRADE URL redirection in Samsung Account prior to version 15.5.01.1 allows local attackers to potentially get access
CVE-2025-58487 MEDIUM 4.0 UPGRADE Improper authorization in Samsung Account prior to version 15.5.01.1 allows local attacker to launch arbitrary

References

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