ApostropheCMS uploadfs leaks Azure SAS token in public attachment URLs
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
The uploadfs package of ApostropheCMS from 1.25.0 before 1.28.0 leaks an account-level SAS token into every public attachment URL when the Azure backend is used with sas: true. The createContainer() function builds the BlobServiceClient from a URL that embeds the full SAS query string, and Azure SDK v12 derived clients inherit it (CWE-522). An unauthenticated remote attacker who can view public attachment URLs can obtain the token, although the attack is considered high complexity.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
ApostropheCMS is an open-source Node.js content management system. From 1.25.0 until 1.28.0, uploadfs Azure backend leaks account-level SAS token into every public attachment URL. When uploadfs is configured with the Azure backend and sas: true, createContainer() builds the BlobServiceClient from a URL that embeds the full SAS query string, and Azure SDK v12 derived clients inherit that query string. This issue is fixed in version 1.28.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 |
| apostrophecms | uploadfs | 1.25.0 to before 1.28.0 | 1.28.0 | Patch available | CNA |
| — | uploadfs (npm) | 1.25.0 to before 1.28.0 | 1.28.0 | Patch available | GHSA-hhph-8536-gfq5 |
- apostrophe Vendorapostrophecms Affected before 4.33.0 Fixed in 4.33.0 Patch available CNA
- uploadfs Vendorapostrophecms Affected 1.25.0 to before 1.28.0 Fixed in 1.28.0 Patch available CNA
- uploadfs (npm) Vendor— Affected 1.25.0 to before 1.28.0 Fixed in 1.28.0 Patch available GHSA-hhph-8536-gfq5
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
Upgrade uploadfs to version 1.28.0 and apostrophe to version 4.33.0, the fixed versions for each product.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA apostrophe (apostrophecms) Fixed in 4.33.0
- Fix · CNA uploadfs (apostrophecms) Fixed in 1.28.0
- Fix · GHSA-hhph-8536-gfq5 uploadfs (npm) Fixed in 1.28.0 Advisory →
Vendor assessments
Timeline
- 2026-10-20 Threatist record created from CVE-2026-113652
- 2026-10-21 Alias added: GHSA-hhph-8536-gfq5
- 2026-10-21 Fix available: npm/[email protected] · GHSA-hhph-8536-gfq5
- 2026-10-21 CVSS score added · GHSA-hhph-8536-gfq5
- 2026-10-21 Weakness changed · GHSA-hhph-8536-gfq5
- 2026-10-21 5 new references · GHSA-hhph-8536-gfq5
- 2026-10-21 CISA SSVC decision points changed
- 2026-10-21 Priority changed: MEDIUM → LOW
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Other 5
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-hhph-8536-gfq5
- 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-2026-113652 · CVE Program
- CVE-2026-113652 · NVD
- FIRST EPSS
- GHSA-hhph-8536-gfq5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-113652 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences