CVE-2026-70279CWE-79cross-site-scripting

CVE-2026-70279

Critical · published October 13, 2026

CVSS v3.1
9.3
EPSS
1%
Percentile
58.0
In the wild
Unconfirmed
What it is

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

The record
Technical detail
CVSS v3.1
9.3 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00857 · 58.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-13T23:19Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70279 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:33Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:01Z
    Microsoft Exchange Server Spoofing Vulnerability
    cvelistv5
  • 13 OCT 19:01Z
    Microsoft Exchange Server Spoofing Vulnerability
    cvelistv5