CVE-2026-29048Network attack vector

Browser script execution via unencoded widget labels

Published Mar 6, 2026 · Updated Mar 6, 2026

Cross-site scripting in HumHub's Button component in 1.18.0 allows remote attackers to execute scripts through crafted labels. Button, Link, Badge, and DropdownMenu rendered label values as HTML by default instead of encoding untrusted text. A vulnerable view or extension must pass attacker-controlled text into one of these widgets, after which the script runs in a viewer's browser.

CVSS severity6.9
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in HumHub's Button component in 1.18.0 allows remote attackers to execute scripts through crafted labels. Button, Link, Badge, and DropdownMenu rendered label values as HTML by default instead of encoding untrusted text. A vulnerable view or extension must pass attacker-controlled text into one of these widgets, after which the script runs in a viewer's browser.

The record

CVE
CVE-2026-29048
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
HumHub GmbH & Co. KG
Product
HumHub
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 1.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HumHub GmbH & Co. KG · HumHubversion== 1.18.0

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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