CVE-2026-55369 Waline login accepts a non-string email as a match-all MongoDB query
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-55369?
CVE-2026-55369 is a medium-severity vulnerability in walinejs waline, published on 28 Oct 2026.
Official description
Waline is a comment system with backend support. Prior to version 1.41.1, the login endpoint POST /api/token reads the email field from the request body without checking its type and passes it straight into the MongoDB storage query. When email is not a string (for example a JSON object such as {"$ne": null}), the MongoDB storage adapter's parseWhere silently DROPS the field rather than rejecting the request, producing an empty filter that matches ALL users. The endpoint then verifies the submitted password against the FIRST user returned (user[0]), which in Waline is the first-registered user — the site administrator. This is a PARTIAL authentication bypass, not a full one. The attacker still needs a valid password for that first user; this is not a zero-knowledge bypass and it does not disclose passwords. Its concrete effects are: (1) the email/identifier factor is removed for the administrator account, (2) user enumeration (a non-string email never fails the "no such user" branch), and (3) credential-stuffing amplification — an attacker can test a leaked or weak password against the administrator account without knowing the administrator's email. This issue has been patched in version 1.41.1.
Which versions are affected by CVE-2026-55369?
2 open source packages ship an affected version, including @waline/vercel.
| Package | Affected | Fixed in |
|---|---|---|
@waline/vercel npm | All versions | 1.41.0 |
@waline/vercel npm | All versions | 1.41.0 |
How do I fix CVE-2026-55369?
Upgrade @waline/vercel to 1.41.0 or later.
Is CVE-2026-55369 being exploited?
There is no known exploitation of CVE-2026-55369 in the wild and no public exploit code.
Sources
Also known as GHSA-jf75-q64q-g65r, GHSA-vvx2-3p2j-gx4m.