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GHSA-f66c-mpj2-3r8h

MediumCVSS 4.3 / 10
Published Oct 21, 2026·Last modified Oct 21, 2026
Affected Components(1)
npm logoapostrophe
< 4.34.0
Description

Summary

The slugTaken endpoint returns a boolean indicating whether a slug is in use across all document types and visibility levels, with no permission or type filter. Any logged-in user (including editors) can enumerate the slug space of private pages, drafts, and archived content.

Details

POST /api/v1/@apostrophecms/doc/slugTaken with body { "slug": "target-slug" } runs a raw existence check against the documents collection. It does not:

  • Check whether the requesting user has read permission for documents of that type.
  • Filter by visibility (public, loginRequired, private).
  • Filter by viewRole.
  • Filter by publication status (draft vs published).

A single authenticated session can iterate the slug space to enumerate the full content inventory of the CMS, including content the user is explicitly prohibited from viewing.

PoC

# Any authenticated session works — editor role sufficient
curl -b "$EDITOR_JAR" -X POST \
  -H "Content-Type: application/json" \
  -d '{"slug":"known-private-page-slug"}' \
  "http://TARGET/api/v1/@apostrophecms/doc/slugTaken"
# → { "taken": true }  — confirms private page exists

curl -b "$EDITOR_JAR" -X POST \
  -H "Content-Type: application/json" \
  -d '{"slug":"zzz-nonexistent"}' \
  "http://TARGET/api/v1/@apostrophecms/doc/slugTaken"
# → { "taken": false }

Impact

Information disclosure. An attacker with any authenticated session can enumerate all slugs in the system, mapping the full content structure of the CMS including private and admin-only content.

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Risk Scores
Base Score
4.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.

Threat Intelligence
4.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.33%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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