CVE-2022-30287: Horde Groupware Webmail Edition through 5.2.22 allows a reflection injection attack through which an attacker

Q: How do I fix CVE-2022-30287?

groupware: upgrade to newer than 5.2.22; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-30287 being exploited?

CVE-2022-30287 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-2022-30287 affect?

CVE-2022-30287 affects groupware, debian linux. Severity is high (CVSS 8.0). Horde Groupware Webmail Edition through 5.2.22 allows a reflection injection attack through which an attacker can instantiate a driver class. This then leads to arbitrary deserialization of PHP objects.

Q: How urgent is CVE-2022-30287?

Priority 63/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

This week

HIGH 8.0WATCHLISTUPGRADEMITIGATE

CVE-2022-30287 is a high-severity flaw (CVSS 8.0) affecting groupware, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Horde Groupware Webmail Edition through 5.2.22 allows a reflection injection attack through which an attacker can instantiate a driver class. This then leads to arbitrary deserialization of PHP objects.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	69.4% (top 1%)
CISA exploited list	No
Weakness	CWE-470, CWE-502
Published	2022-07-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · horde

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

Am I affected?

Timeline

2022-07-28 22:15 UTCPublished CVE record published
2026-06-17 04:43 UTCUpdated Record last modified

horde groupware UPGRADE

Affected: <= 5.2.22

Fixed in: newer than 5.2.22

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 5.2.22 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade groupware

Note

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

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-30287?

groupware: upgrade to newer than 5.2.22; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-30287 being exploited?

CVE-2022-30287 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-2022-30287 affect?

CVE-2022-30287 affects groupware, debian linux. Severity is high (CVSS 8.0). Horde Groupware Webmail Edition through 5.2.22 allows a reflection injection attack through which an attacker can instantiate a driver class. This then leads to arbitrary deserialization of PHP objects.

How urgent is CVE-2022-30287?

Priority 63/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

PHP vulnerabilities · Debian vulnerabilities

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References

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