Healthchecker doesn't show mitigation for CVE-2026-42897 but when I try to install it it says it's already mitigated.
Howdy, I'm just checking in to see if anyone else is seeing the same behavior that I am seeing for CVE-2026-42897
[PS] D:\Exchange\scripts>./Get-Mitigations.ps1
Server : labexchange
Version : Version 15.2 (Build 1544.4)
ID : PING1
Type : Ping
Description : EEMS Heartbeat probe. Does not modify any exchange settings.
Status : Applied
Server : labexchange
Version : Version 15.2 (Build 1544.4)
ID : M2.1.0
Type :
Description : Mitigation invalid for this exchange version.
Status : Applied
So it appears it isn't mitigated here so I tried using EOMT to mitigate it:
.\EOMT.ps1 -CVE "CVE-2026-42897"
Starting EOMT.ps1 version 26.05.14.1633 on labexchange
Resolved mitigation target: CVE-2026-42897 - OWA XSS - Outbound URL Rewrite adding Content-Security-Policy script-src-attr 'none' to OWA HTML responses
Applying CVE-2026-42897 mitigation
This tool applies an IIS URL Rewrite mitigation for CVE-2026-42897.
Mitigations are a temporary measure. Installation of the applicable Security Update
is the ***only way to fully protect your servers***.
Get the latest Exchange Server update here: https://aka.ms/LatestExchangeServerUpdate
Do you want to proceed?
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "Y"): y
[1/1] Checking prerequisites on labexchange
labexchange : Mitigation already applied for CVE-2026-42897 — skipping
Servers not vulnerable (skipped): labexchange
No vulnerable servers to apply mitigation to.
Is anyone seeing something similar or have any explanation for why healthchecker would say it isn't mitigated but EOMT would say it is mitigated?