Public proof of conceptFix available

CVE-2025-54897

Q: Is CVE-2025-54897 actively exploited?

Active exploitation of CVE-2025-54897 has not been confirmed. Its EPSS score was 21.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2025-54897?

CVE-2025-54897 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2025-09-09
Fixed in16.0.19127.20100
WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Timeline

dates in UTC

2025-09-0917:16CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-54897?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-54897?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft sharepoint server

Branch	Affected	Fixed in	Source
16.0	< 16.0.19127.20100	16.0.19127.20100	NVD
2016.x	= 2016	no fix published	NVD
2019.x	= 2019	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Microsoft sharepoint server to 16.0.19127.20100

Advisories and patches

msrc.microsoft.comVendor Advisory

Detection

read 2026-10-23 19:24 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedthemaxlpalfaboy/CVE-2025-54897-LAB

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2025-09-10
OpenCVESSVC decisionnone—
CNACVSS 3.18.8read 2026-10-23
CNAweakness (CWE)CWE-502read 2026-10-23
FIRST EPSSEPSS score21.7 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2025-09-09
Last Modified: 2026-10-18
NVD status: Analyzed

Frequently asked questions

What is CVE-2025-54897?

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Is CVE-2025-54897 actively exploited?

Active exploitation of CVE-2025-54897 has not been confirmed. Its EPSS score was 21.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-54897?

CVE-2025-54897 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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