XSS vulnerability using dialog
Priority LOW 36CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.
Why it matters now
EPSS 0.00736 54th percentileScored 2026-11-07
Fix Fixed misskey (misskey-dev): 12.51.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| misskey-dev | misskey | before 12.51.0 | 12.51.0 | Patch available | CNA |
- misskey Vendormisskey-dev Affected before 12.51.0 Fixed in 12.51.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:* | before 12.51.0 | Vulnerable | misskey-dev |
- cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:* Versions before 12.51.0 Vulnerable ·misskey-dev
Remediation
- Fix · CNA misskey (misskey-dev) Fixed in 12.51.0
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39169
References
More misskey-dev Misskey vulnerabilities
- TI-2025-18599 Misskey CSRF vulnerability due to insecure configuration of authentication cookie attributes CVSS 3.1HIGH 8.2
- TI-2025-29081 Misskey CSS Style Injection Vulnerability In `MkUrlPreview` CVSS 3.1HIGH 7.2
- TI-2025-40906 Misskey has a login rate limit bypass via spoofed X-Forwarded-For header CVSS 4.0MEDIUM 6.9
- TI-2025-29276 Misskey Directory Traversal Vulnerability in AiScript via `Mk:api` CVSS 3.1HIGH 7.5
- TI-2025-40839 misskey.js's export data contains private post data CVSS 4.0HIGH 7.1
- TI-2026-22705 Misskey lacks proper authorization checks and input validation CVSS 4.0CRITICAL 9.2
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences