CVE-2026-53607
@apostrophecms/file pretty-URL Vulnerable to Unauthenticated SSRF via Host header
Impact
ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, when `prettyUrls: true` is enabled on `@apostrophecms/file` (a documented SEO feature for serving uploaded files at clean URLs), the public pretty-URL handler builds the upstream URL using the raw `Host` HTTP request header. That URL is then `fetch`'ed and the response body + headers are streamed straight back to the requester. Because `Host` is fully attacker-controlled, an unauthenticated remote attacker can pivot the apostrophe process to issue outbound HTTP requests against any host it can reach on the private network. The path component is constrained to `/uploads/attachments/<cuid>-<slug>.<ext>` (built from a local-DB lookup), which keeps the impact narrow: cross-instance data exfiltration is neutralized by cuid uniqueness, but blind-SSRF residuals remain (network-topology mapping via response-code / timing differences and verbose proxy/WAF 404 body disclosure). As of time of publication, no known patched versions exist.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | apostrophe | <= 4.30.0 | 4.31.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-34pj-2622-jvxq
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-34pj-2622-jvxq
- https://nvd.nist.gov/vuln/detail/CVE-2026-53607
- https://github.com/apostrophecms/apostrophe/pull/5464
- https://github.com/apostrophecms/apostrophe/commit/5a88e9630cbbdde33154ef8abe7557ddf7be418b