Is there a public exploit for CVE-2026-55008?

No public exploit for CVE-2026-55008 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-55008?

CVE-2026-55008 scores CVSS 9.6 (v3.1), rated critical. EPSS puts the chance of exploitation in the next 30 days at 0.86%.

What does CVE-2026-55008 affect?

CVE-2026-55008 affects Microsoft Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM.

9.6 Critical

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized…

CVE-2026-55008

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.

Assessment

CVSS: 9.6 (v3.1)
Severity: Critical
EPSS: 0.86% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 14 July 2026
Last updated: 10 November 2026
Affected: Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23 · Microsoft Exchange Server 2019 Cumulative Update 14 · Microsoft Exchange Server 2019 Cumulative Update 15 · Microsoft Exchange Server Subscription Edition RTM
Assigner: microsoft

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

At the source

EUVD (ENISA)

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008

Community proofs of concept

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