CVE-2025-40673: DinoRANK Authorization Bypass Vulnerability

CVE-2025-40673 Overview

CVE-2025-40673 is a missing authorization vulnerability [CWE-862] in DinoRANK, a search engine optimization (SEO) platform. The flaw allows any authenticated user to retrieve invoices belonging to other users by requesting PDF files directly from the /facturas/YYYY-MM/SDRYYMM-XXXXX.pdf endpoint. The application does not verify whether the requesting user owns the invoice. Attackers can discover valid filenames through open source intelligence (OSINT), insecure network traffic capture, or brute force enumeration of the predictable filename pattern.

Critical Impact
Attackers with low-privileged access can retrieve billing documents of any DinoRANK customer, exposing personally identifiable information (PII) and financial data.

Affected Products

DinoRANK SEO platform (web application)
Invoice retrieval endpoint /facturas/YYYY-MM/SDRYYMM-XXXXX.pdf
Specific version information is not available in the advisory

Discovery Timeline

2025-05-28 - CVE-2025-40673 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-40673

Vulnerability Analysis

The vulnerability stems from broken access control on the invoice download endpoint. When a user requests a PDF from /facturas/YYYY-MM/SDRYYMM-XXXXX.pdf, DinoRANK serves the file without validating ownership. Any authenticated user who knows or guesses a valid filename receives the invoice.

The filename structure is deterministic. YYYY-MM reflects the invoice year and month, SDR is a static prefix, YYMM encodes the same date, and XXXXX is a sequential identifier. This predictable format significantly reduces the search space for brute force enumeration.

Because the endpoint delivers billing artifacts, exposed data may include customer names, billing addresses, tax identifiers, subscription details, and purchase amounts. This constitutes an insecure direct object reference (IDOR) pattern aligned with CWE-862 Missing Authorization.

Root Cause

The root cause is the absence of an authorization check between the authenticated session and the invoice being requested. The application relies on the obscurity of the filename rather than enforcing an access control decision at the endpoint. Server-side logic should verify that the current user owns the referenced invoice before returning the file.

Attack Vector

An attacker with a valid low-privileged DinoRANK account can send HTTP GET requests to the invoice endpoint with iterated filenames. Filenames can be recovered through OSINT (leaked invoices posted online), captured in unencrypted network traffic, or produced by enumerating the sequential XXXXX counter for a given month. The attack requires no user interaction from the victim.

No verified proof-of-concept code is published. See the INCIBE Security Notice for the coordinated disclosure details.

Detection Methods for CVE-2025-40673

Indicators of Compromise

Repeated HTTP GET requests from a single session to /facturas/YYYY-MM/SDR*.pdf with varying sequential identifiers
Successful 200 OK responses to invoice URLs that do not correspond to the requesting account's billing history
Anomalous volume of PDF downloads from a single IP address or user agent within a short time window

Detection Strategies

Correlate authenticated session identifiers with the ownership metadata of each requested invoice; flag mismatches
Baseline normal invoice download behavior per account and alert on deviations such as bulk retrieval
Instrument the invoice endpoint with structured access logs that capture requester ID, target filename, and authorization outcome

Monitoring Recommendations

Ingest DinoRANK web server and application logs into a centralized analytics platform for retention and querying
Alert on sequential enumeration patterns against the /facturas/ path
Review web application firewall (WAF) telemetry for repeated 4xx or 2xx responses on PDF endpoints outside normal usage

How to Mitigate CVE-2025-40673

Immediate Actions Required

Contact DinoRANK support to confirm remediation status and request timeline information for a fix
Restrict access to the invoice endpoint at the reverse proxy or WAF layer until the vendor confirms a patch is deployed
Review historical access logs for signs of unauthorized invoice retrieval and notify affected customers if exposure is identified

Patch Information

No vendor patch reference is included in the advisory published by INCIBE-CERT. Customers should monitor the DinoRANK vendor channels for a fix that introduces server-side authorization checks tying the authenticated session to invoice ownership.

Workarounds

Enforce transport layer security (TLS) end-to-end to prevent filename disclosure through network interception
Remove or redact invoice URLs from any publicly indexed pages, shared inboxes, or ticketing systems
Rotate session tokens and audit user accounts to limit low-privilege access to only necessary users

bash

# Example WAF rule to block enumeration of the invoice endpoint
# Deny anonymous access and rate-limit authenticated requests
SecRule REQUEST_URI "@rx ^/facturas/[0-9]{4}-[0-9]{2}/SDR[0-9]{4}-[0-9]{5}\.pdf$" \
    "id:1040673,phase:1,deny,status:403,\
    msg:'CVE-2025-40673: DinoRANK invoice endpoint access blocked',\
    chain"
    SecRule &REQUEST_HEADERS:Cookie "@eq 0"