CVE-2026-29048: HumHub is an Open Source Enterprise Social Network

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-29048 is a medium-severity flaw (CVSS 6.1) affecting humhub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software, malicious scripts could be injected and executed in the context of the user's browser. This issue has been patched in version 1.18.1.

Why this priority

No elevated risk signals yet

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	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: humhub

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

Am I affected?

Timeline

2026-03-06 07:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

humhub humhub DOWNGRADE

Affected: 1.18.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.18.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.18.0 (Debian / Ubuntu)

apt-cache madison humhub sudo apt install humhub=<VERSION_BEFORE_1.18.0> sudo apt-mark hold humhub

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

dnf --showduplicates list humhub sudo dnf downgrade humhub-<VERSION_BEFORE_1.18.0> sudo dnf versionlock add humhub

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-2026-29048?

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

Is CVE-2026-29048 being exploited?

CVE-2026-29048 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-2026-29048 affect?

CVE-2026-29048 affects humhub. Severity is medium (CVSS 6.1). HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software,

How urgent is CVE-2026-29048?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2025-64442 MEDIUM 6.1 UPGRADE HumHub is an Open Source Enterprise Social Network
CVE-2024-52043 MEDIUM 5.3 UPGRADE Generation of Error Message Containing Sensitive Information in HumHub GmbH & Co

References

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