PT-2026-4306 · Microsoft · Account

Bufsnake · Published 2026-01-22 · Updated 2026-03-01 · CVE-2026-21264

Positive Technologies (AI Summary)

CVSS v3.1

9.4

Critical

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Microsoft Account (affected versions not specified)

Description The issue involves improper neutralization of input during web page generation, specifically a 'cross-site scripting' condition within Microsoft Account. This allows an unauthorized attacker to perform spoofing over a network.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2026-00846

CVE-2026-21264

Affected Products

Account

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2026-21264 · Security Note
• https://bdu.fstec.ru/vul/2026-00846 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21264 · Vendor Advisory
• https://t.me/poxek/5851 · Telegram Post
• https://twitter.com/rahsi_aaka/status/2014934188923986417 · Twitter Post
• https://twitter.com/CVEnew/status/2014576993619353629 · Twitter Post
• https://t.me/msrcreports/3001 · Telegram Post
• https://t.me/cveNotify/150721 · Telegram Post
• https://twitter.com/NCIIPC/status/2014666890753540341 · Twitter Post
• https://twitter.com/CveFindCom/status/2014483077142106433 · Twitter Post
• https://twitter.com/TheHackerWire/status/2014489153136951430 · Twitter Post
• https://t.me/cveNotify/149624 · Telegram Post