CVE-2023-26986: An issue in China Mobile OA Mailbox PC v2.9.23 allows remote attackers to execute arbitrary commands on a vict

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HIGH 7.8DOWNGRADE

CVE-2023-26986 is a high-severity flaw (CVSS 7.8) affecting oa mailbox pc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in China Mobile OA Mailbox PC v2.9.23 allows remote attackers to execute arbitrary commands on a victim host via user interaction with a crafted EML file sent to their OA mailbox.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Published	2023-04-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chinamobileltd

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

Am I affected?

Timeline

2023-04-10 16:15 UTCPublished CVE record published
2026-06-17 05:44 UTCUpdated Record last modified

chinamobileltd oa mailbox pc DOWNGRADE

Affected: 2.9.23

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.9.23

1. Check installed version

apt-cache policy oa-mailbox-pc || rpm -q oa-mailbox-pc || oa-mailbox-pc --version

2. No fixed release: DOWNGRADE to a release before 2.9.23 (Debian / Ubuntu)

apt-cache madison oa-mailbox-pc sudo apt install oa-mailbox-pc=<VERSION_BEFORE_2.9.23> sudo apt-mark hold oa-mailbox-pc

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oa-mailbox-pc sudo dnf downgrade oa-mailbox-pc-<VERSION_BEFORE_2.9.23> sudo dnf versionlock add oa-mailbox-pc

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-26986?

oa mailbox pc: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26986 being exploited?

CVE-2023-26986 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-2023-26986 affect?

CVE-2023-26986 affects oa mailbox pc. Severity is high (CVSS 7.8). An issue in China Mobile OA Mailbox PC v2.9.23 allows remote attackers to execute arbitrary commands on a victim host via user interaction with a crafted EML file sent to their OA mailbox.

How urgent is CVE-2023-26986?

Priority 43/100. High severity; Public exploit reference

References

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