CVE-2025-55243: Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized att

Q: How do I fix CVE-2025-55243?

officeplus: upgrade to 3.10.0.26585. Exact commands for each OS are on this page.

Q: Is CVE-2025-55243 being exploited?

CVE-2025-55243 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-55243 affect?

CVE-2025-55243 affects officeplus. Severity is high (CVSS 7.5). Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized attacker to perform spoofing over a network.

Q: How urgent is CVE-2025-55243?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2025-55243 is a high-severity flaw (CVSS 7.5) affecting officeplus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized attacker to perform spoofing over a network.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-200
Published	2025-09-09
Last modified	2026-06-17

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-09 17:16 UTCPublished CVE record published
2026-06-17 09:41 UTCUpdated Record last modified

microsoft officeplus UPGRADE

Affected: < 3.10.0.26585

Fixed in: 3.10.0.26585

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy officeplus || rpm -q officeplus || officeplus --version

2. UPGRADE to 3.10.0.26585 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade officeplus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade officeplus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-55243?

officeplus: upgrade to 3.10.0.26585. Exact commands for each OS are on this page.

Is CVE-2025-55243 being exploited?

CVE-2025-55243 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-55243 affect?

CVE-2025-55243 affects officeplus. Severity is high (CVSS 7.5). Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized attacker to perform spoofing over a network.

How urgent is CVE-2025-55243?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Microsoft Office vulnerabilities

Related CVEs

CVE-2024-38084 HIGH 7.8 UPGRADE Microsoft OfficePlus Elevation of Privilege Vulnerability

References

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