by Kastro
Paper/Archive/CVE-2026-55008

CVE-2026-55008

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 — Microsoft Exchange Server Spoofing Vulnerability

EPSS 0.9%CVSS 9.6
critical.is priorityof 100
41
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 58.5.585 × 2011.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Microsoft Exchange Server 2016 Cumulative Update 2315.01.0.0 – < 15.01.2507.07115.01.2507.071CNA
Microsoft Exchange Server 2019 Cumulative Update 1415.02.0.0 – < 15.02.1544.04315.02.1544.043CNA
Microsoft Exchange Server 2019 Cumulative Update 1515.02.0.0 – < 15.02.1748.04815.02.1748.048CNA
Microsoft Exchange Server Subscription Edition RTM15.02.0.0 – < 15.02.2562.04515.02.2562.045CNA

Scores by source

microsoft (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008