Unrated

Unauthenticated soft-deleted note metadata disclosure in note-mark backend

IdentifiersCVE-2026-50554CWE-200

CVE-2026-50554 is an information disclosure vulnerability in the note-mark backend affecting the notes listing endpoint for public books. An unauthenticated attacker can request note listings with the deleted=true parameter and enumerate metadata for soft-deleted notes that should only be visible to the owning user. The exposed data includes note identifiers, titles, slugs, and timestamps associated with deleted notes. The flaw stems from improper authorization logic in which requests for soft-deleted notes are incorrectly allowed through the public-book authorization path instead of being restricted to owner-only access. The vulnerability does not expose the body or content of the deleted notes, but it defeats the intended privacy and deletion semantics for note metadata.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows anonymous disclosure of metadata for soft-deleted notes in public books. This enables attackers to enumerate deleted note records and recover identifying and temporal information that users would reasonably expect to be hidden after deletion. Although note content is not exposed, the leaked metadata can reveal sensitive contextual information, support reconnaissance, and undermine privacy expectations and application data handling guarantees.

Mitigation

If you can’t patch tonight, do this now.

Until a fixed version is deployed, restrict or disable unauthenticated access to the affected notes listing functionality and enforce that requests using deleted=true are accepted only for authenticated book owners. If feasible, block external access to the deleted-notes listing route at the reverse proxy, API gateway, or application layer, and add compensating authorization checks that deny anonymous or non-owner requests for soft-deleted note listings.

Remediation

Patch, then assume compromise.

Upgrade the affected package to version 0.0.0-20260601210758-9c9b72740f22 or later. The authorization logic for the notes listing endpoint should be corrected so that requests with deleted=true bypass any public-book access path and are authorized only for the authenticated owner of the book. Validation and access-control tests should be added to ensure soft-deleted resources cannot be enumerated anonymously or by non-owners.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity