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CVE-2021-43847

Authorization Bypass in Space Invite in HumHub

MEDIUM
6.5
CVSS Score
Published: December 20, 2021 at 09:35 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorHumHub

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HumHub· Humhub
95%
v < 1.10.3v < 1.9.31.10.0 ≤ v < 1.10.3
Affected range stops below 1.10.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/humhub/humhub/pull/5473
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/humhub/humhub/releases/tag/v1.10.3
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/humhub/humhub/releases/tag/v1.9.3
x_refsource_CONFIRMExploitThird Party Advisory
Source: [email protected]
https://github.com/humhub/humhub/security/advisories/GHSA-f5hc-5wfr-7v74
x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://huntr.dev/bounties/943dad83-f0ed-4c74-ba81-7dfce7ca0ef2/

CVSS

6.5MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-285CWE-862

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