ApostropheCMS exposes user objects to anonymous visitors
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
The apostrophe npm package of ApostropheCMS before 4.33.0 is affected. Incorrect authorization (CWE-863) means viewRole is not applied to anonymous visitors when user objects are exposed through a publicly rendered relationship or public API. An unauthenticated remote attacker can read user fields that templates disclose, such as a fully serialized related user object, while password hashes are stored separately and are not affected.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0, viewRole is not applied to anonymous visitors when a developer exposes user objects through a publicly rendered relationship or expressly enabled public API. Inadequately limited templates, including serialization of an entire related user object, can conditionally disclose user fields, but relationships do not automatically publish full user objects and password hashes are stored separately and are not affected. This issue is fixed in version 4.33.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| apostrophecms | apostrophe | before 4.33.0 | 4.33.0 | Patch available | CNA |
| — | apostrophe (npm) | before 4.33.0 | 4.33.0 | Patch available | GHSA-xf6w-q65w-4f2w |
- apostrophe Vendorapostrophecms Affected before 4.33.0 Fixed in 4.33.0 Patch available CNA
- apostrophe (npm) Vendor— Affected before 4.33.0 Fixed in 4.33.0 Patch available GHSA-xf6w-q65w-4f2w
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apostrophecms:apostrophecms:*:*:*:*:*:*:*:* | — | — | apostrophecms |
- cpe:2.3:a:apostrophecms:apostrophecms:*:*:*:*:*:*:*:* Versions — — ·apostrophecms
Remediation
Update the apostrophe npm package to version 4.33.0, which fixes this issue.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
- Fix · CNA apostrophe (apostrophecms) Fixed in 4.33.0
- Fix · GHSA-xf6w-q65w-4f2w apostrophe (npm) Fixed in 4.33.0 Advisory →
Timeline
- 2026-10-20 Threatist record created from CVE-2026-113653
- 2026-10-20 CISA SSVC decision points changed
- 2026-10-20 Priority changed: MEDIUM → LOW
- 2026-10-21 Alias added: GHSA-xf6w-q65w-4f2w
- 2026-10-21 Fix available: npm/[email protected] · GHSA-xf6w-q65w-4f2w
- 2026-10-21 CVSS score added · GHSA-xf6w-q65w-4f2w
- 2026-10-21 Weakness changed · GHSA-xf6w-q65w-4f2w
- 2026-10-21 5 new references · GHSA-xf6w-q65w-4f2w
References
Other 5
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-xf6w-q65w-4f2w
- https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce
- https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350
- https://github.com/apostrophecms/apostrophe/releases/tag/[email protected]
- https://github.com/apostrophecms/apostrophe
More apostrophecms vulnerabilities
- TI-2026-25223 ApostropheCMS has Arbitrary File Write (Zip Slip / Path Traversal) in Import-Export Gzip Extraction CVSS 3.1CRITICAL 10.0
- TI-2026-32848 Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html` CVSS 3.1CRITICAL 9.3
- TI-2026-38664 @apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Injected into Script Tag CVSS 3.1HIGH 8.7
- TI-2026-27673 ApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS CVSS 3.1HIGH 8.7
- TI-2026-76992 Unauthenticated resource exhaustion via ApostropheCMS import routes CVSS 3.1HIGH 7.5
- TI-2026-76974 ApostropheCMS leaves rejected CSV uploads in temporary directory CVSS 3.1HIGH 7.5
Sources
- CVE-2026-113653 · CVE Program
- CVE-2026-113653 · NVD
- FIRST EPSS
- GHSA-xf6w-q65w-4f2w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences