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Response snapshot Oct 29, 2026, 01:26 UTC

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VulnerabilityGHSA-jf75-q64q-g65r

Waline login accepts a non-string email as a match-all MongoDB query

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.

Published Updated

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: @waline/vercel: 1.41.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-jf75-q64q-g65r (opens a new tab)

What happened

Summary

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.

Continue reading

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.

Details

Untyped input — packages/server/src/controller/token.js:17-18:

 const { email, password, code } = this.post();
 const user = await this.modelInstance.select({ email });

` email comes from the request body with no type check.

The storage adapter silently drops a non-string key — packages/server/src/service/storage/mongodb.js, parseWhere():

 if (think.isString(where[k])) { filter[parseKey(k)] = { $eq: ... }; continue; } // intended guard
 if (where[k] === undefined) { ... }
 if (Array.isArray(where[k]) && where[k][0]) { ... operator handling (IN/LIKE/!=/> ...) }

A plain object such as {"$ne": null} is neither a string, undefined, nor an array, so NONE of the branches run and nothing is added to filter for email. The result is filter = {} -> instance.where({}) -> MongoDB find({}) returns every user. (The array form, e.g. ["!=", ""], is a genuine operator injection that reaches $ne with the same match-all effect.)

First user is selected — token.js:22-26:

 if (think.isEmpty(user) || isVerifyUser || isBannedUser) { return this.fail(); } // match-all -> not empty -> passes
 const checkPassword = this.checkPassword(password, user[0].password);

user[0] is the first record in MongoDB natural (insertion) order, i.e. the earliest-registered user, which in Waline is the administrator.

No upstream type validation — packages/server/src/logic/token.js:37-38:

 async postAction() { await this.useCaptchaCheck(); }

The only pre-check is the captcha; there is no isString(email/password) validation.

Proof of Concept

Send a login request whose email is a non-string value:

 POST /api/token HTTP/1.1
 Content-Type: application/json

 {"email": {"$ne": null}, "password": " "}

- Because email is not a string, parseWhere adds nothing for it, so the query filter is {} and MongoDB returns all users. - user[0] — the first-registered user, i.e. the administrator — is selected, and the submitted password is checked against the administrator's hash.

- If the password matches (for example via credential stuffing or a known/weak password), the attacker is authenticated as the administrator without ever knowing the administrator's email. - Even when the password does not match, the request confirms that users exist (enumeration) and that the email factor is bypassable.

Impact

An unauthenticated attacker can bypass the email/identifier factor of authentication for the first-registered user (the administrator) and have an arbitrary password checked directly against that account.

This: - enables user enumeration; - amplifies credential stuffing against the administrator (no need to know the admin email — a leaked or weak password can be tested directly); - and, when the attacker possesses a valid password for that account (e.g. a reused/breached one), results in administrator login.

This is bounded: it is NOT a zero-knowledge authentication bypass, it does NOT reveal passwords, and it targets the first-returned user rather than an arbitrary chosen account. It is rated Medium accordingly. (If exploitation succeeds in logging in, the attacker then holds the administrator session; that downstream impact is conditional on already having a valid password, which is reflected in the High attack complexity rather than in the confidentiality/integrity metrics.)

Remediation

Validate the types of email and password as strings before they reach the storage query — for example in packages/server/src/logic/token.js postAction():

 const { email, password } = this.post();
 if (!think.isString(email) || !think.isString(password)) {
 return this.ctx.throw(400, 'Invalid input type');
 }

Defense in depth: in mongodb.js parseWhere(), reject (rather than silently drop) a value that is neither a string nor a supported array form, or coerce it to {$eq: String(value)}, so a non-string key can never elide the filter.

Affected package ranges reported by GitHub: @waline/vercel: <= 1.40.3

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Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-jf75-q64q-g65r (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-jf75-q64q-g65r, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). Waline login accepts a non-string email as a match-all MongoDB query. https://kevwire.com/record/GHSA-jf75-q64q-g65r

MLA

"Waline login accepts a non-string email as a match-all MongoDB query." KEVWire, 28 Oct. 2026, kevwire.com/record/GHSA-jf75-q64q-g65r.

Chicago

KEVWire. "Waline login accepts a non-string email as a match-all MongoDB query." Last modified October 28, 2026. https://kevwire.com/record/GHSA-jf75-q64q-g65r.

Evidence summary (plain text)

Waline login accepts a non-string email as a match-all MongoDB query (Oct 28, 2026).
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.
Sources:
GitHub-reviewed advisory GHSA-jf75-q64q-g65r: https://github.com/advisories/GHSA-jf75-q64q-g65r
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-jf75-q64q-g65r.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 29, 2026, 00:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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