CVE-2026-32807 Overview
CVE-2026-32807 is a broken access control vulnerability [CWE-285] in dataCycle-CORE, the module that handles core processing and framework rules for the dataCycle data management system. In versions up to and including 25.07.3, the DataLink route serves attached text files to anyone who possesses the DataLink UUID. The route bypasses expiration checks, authentication, and the standard authorization logic used by the normal show flow. Because the mailer embeds the direct file URL, any leaked, forwarded, logged, or stale email link continues to expose the underlying attachment.
Critical Impact
Unauthenticated network attackers can retrieve confidential attachments by replaying or guessing DataLink UUIDs, resulting in high confidentiality impact.
Affected Products
- dataCycle-CORE versions up to and including 25.07.3
- Deployments using DataLink email notifications that embed direct file URLs
- Any dataCycle instance exposing the DataLink route to untrusted networks
Discovery Timeline
- 2026-07-20 - CVE-2026-32807 published to NVD
- 2026-07-21 - Last updated in NVD database
Technical Details for CVE-2026-32807
Vulnerability Analysis
The vulnerability resides in the DataLink download route within dataCycle-CORE. This route accepts a DataLink UUID and returns the attached text file directly. Unlike the normal show flow, the download endpoint does not evaluate expiration timestamps, session state, or role-based permissions. The route is publicly reachable and responds to any HTTP client that presents a valid UUID.
The attack does not require credentials, user interaction, or elevated privileges. An attacker with a leaked URL can retrieve the associated file long after the DataLink was intended to expire. The impact is limited to confidentiality; integrity and availability are not affected.
Root Cause
The root cause is missing authorization on the file-fetch route. Access control checks that exist in the standard show handler were not applied to the direct download path. The mailer compounds the exposure by embedding the raw file URL in outbound email, extending the attack surface to any downstream system that stores or forwards those messages.
Attack Vector
Exploitation is straightforward. An attacker who obtains a DataLink URL through email logs, mail forwarding, browser history, proxy logs, or SIEM archives issues a plain HTTP GET request to the DataLink endpoint. The server returns the attachment regardless of link expiration, caller identity, or session state. See the GitHub Security Advisory GHSA-gj99-3h7x-v4rv for technical details.
Detection Methods for CVE-2026-32807
Indicators of Compromise
- Repeated HTTP GET requests to DataLink download URLs from unexpected source IP addresses or user agents
- Access to DataLink URLs after their intended expiration window
- Requests to DataLink endpoints without a preceding authenticated session on the dataCycle host
Detection Strategies
- Review web server and reverse proxy logs for accesses to the DataLink download route and correlate with the DataLink issuance timestamp
- Alert on DataLink URL retrievals from IP ranges outside the intended recipient's expected geography or ASN
- Cross-reference mail delivery logs with DataLink downloads to identify secondary retrieval by non-recipients
Monitoring Recommendations
- Enable verbose request logging for the DataLink controller and forward logs to a centralized analytics platform
- Instrument the application to emit a structured audit event each time a DataLink attachment is served, including UUID, source IP, and timestamp
- Track download counts per DataLink UUID and flag any UUID accessed more than once or accessed after expiration
How to Mitigate CVE-2026-32807
Immediate Actions Required
- Upgrade dataCycle-CORE to a version later than 25.07.3 once the maintainer publishes a fixed release
- Invalidate all existing DataLink UUIDs and reissue links to legitimate recipients after patching
- Restrict network access to the DataLink route using an authenticating reverse proxy or VPN until a patched build is deployed
Patch Information
Consult the GitHub Security Advisory GHSA-gj99-3h7x-v4rv for the authoritative fix version and upgrade instructions from the dataCycle-engine maintainers.
Workarounds
- Place the DataLink endpoint behind an authenticating gateway that validates recipient identity before proxying the request
- Configure the mailer to send indirect links that require recipient authentication instead of embedding direct file URLs
- Purge historical email logs and archived messages that contain DataLink URLs to reduce residual exposure
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
