CVE-2026-77166
Summary
| CVE | CVE-2026-77166 |
|---|---|
| State | PUBLISHED |
| Assigner | hackerone |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-21 16:17:24 UTC |
| Updated | 2026-09-22 20:00:03 UTC |
| Description | The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items. |
Risk And Classification
Primary CVSS: v3.0 2.4 LOW from [email protected]
CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
EPSS: 0.001880000 probability, percentile 0.087200000 (date 2026-09-23)
Problem Types: CWE-840 | CWE-840 CWE-840 Business Logic Errors
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.0 | [email protected] | Secondary | 2.4 | LOW | CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N |
| 3.0 | CNA | DECLARED | 2.4 | LOW | CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N |
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
HighUser Interaction
RequiredScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
NoneCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Nextcloud | Collectives | affected 3.2.1 3.5.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| hackerone.com/reports/3599470 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | hackerone.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: _dha (yoyomiski) (en)
There are currently no legacy QID mappings associated with this CVE.