CVE-2020-26554: REDDOXX MailDepot 2033 (aka 2.3.3022) allows XSS via an incoming HTML e-mail message.

This month

MEDIUM 6.1DOWNGRADE

CVE-2020-26554 is a medium-severity flaw (CVSS 6.1) affecting maildepot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

REDDOXX MailDepot 2033 (aka 2.3.3022) allows XSS via an incoming HTML e-mail message.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-11-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: reddoxx

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

Am I affected?

Timeline

2020-11-18 17:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

reddoxx maildepot DOWNGRADE

Affected: 2033

Fixed in: no fixed release known

Safe to downgrade to: a release before 2033

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2033 (Debian / Ubuntu)

apt-cache madison maildepot sudo apt install maildepot=<VERSION_BEFORE_2033> sudo apt-mark hold maildepot

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

dnf --showduplicates list maildepot sudo dnf downgrade maildepot-<VERSION_BEFORE_2033> sudo dnf versionlock add maildepot

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-2020-26554?

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

Is CVE-2020-26554 being exploited?

CVE-2020-26554 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-2020-26554 affect?

CVE-2020-26554 affects maildepot. Severity is medium (CVSS 6.1). REDDOXX MailDepot 2033 (aka 2.3.3022) allows XSS via an incoming HTML e-mail message.

How urgent is CVE-2020-26554?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2019-19200 HIGH 8.8 DOWNGRADE REDDOXX MailDepot 2032 2.2.1242 allows authenticated users to access the mailboxes of other users.
CVE-2019-19199 HIGH 7.4 DOWNGRADE REDDOXX MailDepot 2032 SP2 2.2.1242 has Insufficient Session Expiration because tokens are not invalidated upo

References

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