TI-2026-76992 Aliases CVE-2026-113711 GHSA-86wm-68pq-5jwq

Unauthenticated resource exhaustion via ApostropheCMS import routes

HIGH 72CWE-400Published 2026-10-20 · Updated 2026-10-20

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

ApostropheCMS before 4.33.0 and the @apostrophecms/import-export module before 3.7.0 are affected. Import routes run the big upload middleware before the user authorization check, so upload setup, chunk storage and temporary processing happen for unauthenticated requests (CWE-400). An unauthenticated remote attacker can exhaust server resources, which degrades availability.

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 of ApostropheCMS and 3.7.0 of the import-export module, import routes invoke bigUploadMiddleware without an early authorize callback, allowing unauthenticated requests to perform upload initialization, chunk storage, temporary processing, and attacker-declared cleanup work before the later user check rejects the import. This issue is fixed in ApostropheCMS 4.33.0 and import-export 3.7.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00561 46th percentileScored 2026-11-07

Fix Fixed apostrophe (apostrophecms): 4.33.0import-export (@apostrophecms): 3.7.0+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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
apostrophecms	import-export	before 3.7.0	3.7.0	Patch available	CNA
—	apostrophe (npm)	before 4.33.0	4.33.0	Patch available	GHSA-86wm-68pq-5jwq
—	@apostrophecms/import-export (npm)	before 3.7.0	3.7.0	Patch available	GHSA-86wm-68pq-5jwq

apostrophe Vendorapostrophecms Affected before 4.33.0 Fixed in 4.33.0 Patch available CNA
import-export Vendorapostrophecms Affected before 3.7.0 Fixed in 3.7.0 Patch available CNA
apostrophe (npm) Vendor— Affected before 4.33.0 Fixed in 4.33.0 Patch available GHSA-86wm-68pq-5jwq
@apostrophecms/import-export (npm) Vendor— Affected before 3.7.0 Fixed in 3.7.0 Patch available GHSA-86wm-68pq-5jwq

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 ApostropheCMS to 4.33.0 and @apostrophecms/import-export to 3.7.0, which fix the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA apostrophe (apostrophecms) Fixed in 4.33.0
Fix · CNA import-export (@apostrophecms) Fixed in 3.7.0
Fix · GHSA-86wm-68pq-5jwq apostrophe (npm) Fixed in 4.33.0 Advisory →
Fix · GHSA-86wm-68pq-5jwq @apostrophecms/import-export (npm) Fixed in 3.7.0 Advisory →

Timeline

2026-10-20 Threatist record created from CVE-2026-113711
2026-10-20 CISA SSVC decision points changed
2026-10-20 Priority changed: MEDIUM → HIGH
2026-10-21 Alias added: GHSA-86wm-68pq-5jwq
2026-10-21 Fix available: npm/@apostrophecms/[email protected], npm/[email protected] · GHSA-86wm-68pq-5jwq
2026-10-21 CVSS score added · GHSA-86wm-68pq-5jwq
2026-10-21 Weakness changed · GHSA-86wm-68pq-5jwq
2026-10-21 6 new references · GHSA-86wm-68pq-5jwq

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-113711

Other 5

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-2026-76974 ApostropheCMS leaves rejected CSV uploads in temporary directory CVSS 3.1HIGH 7.5
TI-2026-38665 Prototype pollution in apostrophecms apostrophe CVSS 3.1CRITICAL 9.1

See all 65 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences