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Vulnerability record · CVE-2021-43847 · published 20 December 2021

CVE-2021-43847: Humhub improper authorization vulnerability

Humhub · Humhub

HumHub is an open-source social network kit written in PHP. Prior to HumHub version 1.10.3 or 1.9.3, it could be possible for registered users to become unauthorized members of private Spaces. Versions 1.10.3 and 1.9.3 contain a patch for this issue.

6.5 CVSS 3.1 Medium EPSS 1.2% · top 33.4% CWE-285 · Improper authorizationCWE-862 · Missing authorization
6.5CVSS 3.1 base score, v2 4.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

HumHub is an open-source social network kit written in PHP. Prior to HumHub version 1.10.3 or 1.9.3, it could be possible for registered users to become unauthorized members of private Spaces. Versions 1.10.3 and 1.9.3 contain a patch for this issue.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/humhub/humhub/pull/5473 PatchThird Party Advisory
https://github.com/humhub/humhub/releases/tag/v1.10.3 Release NotesThird Party Advisory
https://github.com/humhub/humhub/releases/tag/v1.9.3 Release NotesThird Party Advisory
https://github.com/humhub/humhub/security/advisories/GHSA-f5hc-5wfr-7v74 ExploitThird Party Advisory
https://huntr.dev/bounties/943dad83-f0ed-4c74-ba81-7dfce7ca0ef2/ ExploitIssue TrackingPatchThird Party Advisory
https://github.com/humhub/humhub/pull/5473 PatchThird Party Advisory
https://github.com/humhub/humhub/releases/tag/v1.10.3 Release NotesThird Party Advisory
https://github.com/humhub/humhub/releases/tag/v1.9.3 Release NotesThird Party Advisory
https://github.com/humhub/humhub/security/advisories/GHSA-f5hc-5wfr-7v74 ExploitThird Party Advisory
https://huntr.dev/bounties/943dad83-f0ed-4c74-ba81-7dfce7ca0ef2/ ExploitIssue TrackingPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-20028Humhub improper privilege management vulnerabilityA vulnerability was found in HumHub 0.20.1/1.0.0-beta.3. It has been classified as critical. This affects an unknown part. The manipulation leads to …EPSS 0.81%7.5CVE-2014-9528Humhub sql injection vulnerabilitySQL injection vulnerability in the actionIndex function in protected/modules_core/notification/controllers/ListController.php in HumHub 0.10.0-rc.1 a…EPSS 2.3%7.1CVE-2025-64442Humhub cross-site scripting vulnerabilityHumHub is an Open Source Enterprise Social Network. Versions below 1.17.4 have a XSS vulnerability in the Meta-Search feature which allows malicious …EPSS 0.23%6.9CVE-2026-29048Humhub cross-site scripting vulnerabilityHumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of…EPSS 0.33%6.9CVE-2024-52043Humhub error message information leak vulnerabilityGeneration of Error Message Containing Sensitive Information in HumHub GmbH & Co. KG - HumHub on Linux allows: Excavation (user enumeration).This iss…EPSS 0.43%6.5CVE-2022-24865Humhub information exposure vulnerabilityHumHub is an Open Source Enterprise Social Network. In affected versions users who are forced to change their password by an administrator may retrie…EPSS 1.2%6.1CVE-2017-20026Humhub cross-site scripting vulnerabilityA vulnerability has been found in HumHub up to 1.0.1 and classified as problematic. Affected by this vulnerability is an unknown functionality. The m…EPSS 0.77%6.1CVE-2017-20027Humhub cross-site scripting vulnerabilityA vulnerability was found in HumHub up to 1.0.1 and classified as problematic. Affected by this issue is some unknown functionality. The manipulation…EPSS 0.64%

Source: NIST National Vulnerability Database (record CVE-2021-43847), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.