HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that Space. Versions 1.13.0 through 1.18.2 are affected. The vulnerability has been patched in version 1.18.3, and all users are encouraged to upgrade to this version or later immediately. No known workaround is available.
CVE-2026-47657
HIGHPre-NVD 7.17.1Trending — 3 sources updated this week
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.1
- EG Score
- 7.1(low)
- EPSS
- 12.0%
- KEV
- Not listed
Published
July 21, 2026
Last Modified
July 21, 2026
Advisory Details (2)
Auto-updated Jul 21, 2026Patch available. Sources: github_pr, github.
github Patch Available
Missing Authorization on Remove All Space Members Action · Advisory · humhub/humhub · GitHub
Affected: version 1.18.3, and all users are encouraged to upgrade to this version or later
https://github.com/humhub/humhub/security/advisories/GHSA-hj67-5q6h-j7c2github_pr Patch Available
Fix remove all space members permission
Patch available: humhub/humhub v1.18.3 (PR #8163 merged 2026-05-18)
https://github.com/humhub/humhub/pull/8163Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 19:19 UTCEG score recompute
- 2026-07-21 18:04 UTCEG score recompute
- 2026-07-21 18:03 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-47657?
CVE-2026-47657 is a high vulnerability published on July 21, 2026. HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that…
When was CVE-2026-47657 disclosed?
CVE-2026-47657 was first published in the National Vulnerability Database on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47657 actively exploited?
CVE-2026-47657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47657?
CVE-2026-47657 has a CVSS v3 base score of 7.1 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-47657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47657, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-47657
Is Your Infrastructure Affected by CVE-2026-47657?
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