CVE-2026-64670
Stored XSS in @waline/client via the unsanitized markdown preview of a comment's raw body on edit
Description
Waline is a comment system with backend support. In versions 3.15.2 and prior, @waline/client renders the comment editor's live preview with marked and no sanitizer (utils/markdown.ts), and the preview is injected with v-html. When a comment is edited, the editor is seeded with the comment's raw, un-sanitized body (orig). Only administrators and the comment owner can edit. So an administrator who clicks Edit on an attacker's comment renders that attacker's raw HTML in their own session: an unauthenticated commenter achieves privilege-escalation stored XSS against a moderator with a single Edit click. At time of publication, there are no publicly available patches.
INFO
Published Date :
Nov. 11, 2026, 3:42 a.m.
Last Modified :
Nov. 11, 2026, 3:42 a.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-64670
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update Waline to a version that includes a fix.
- Sanitize comment content before rendering previews.
- Avoid rendering un-sanitized content with v-html.
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CVE-2026-64670 vulnerability anywhere in the article.