# CVE-2026-64670: Stored XSS in @waline/client via the unsanitized markdown preview of a comment's raw body on edit

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- walinejs / waline: <= 3.15.2 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 9.3 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79, CWE-116

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/walinejs/waline/security/advisories/GHSA-crj3-q72p-ggqm (CNA: GitHub_M; x_refsource_CONFIRM)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-64670; retrieved 2026-11-11; source updated 2026-11-11

Revision: 2b54a554fde76c007cf7dd739127021d29b504903a7db89adad078319693d1ac

Canonical: https://y2.dev/cve/CVE-2026-64670

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