CVE-2026-15907 Overview
CVE-2026-15907 is a SQL injection vulnerability affecting H3C SecPath F1000-C8300 firewalls up to build 20260522. The flaw resides in the web management interface, specifically in the /webui/?g=log_fw_nbc_mail_jsondata endpoint. Attackers can manipulate the subject argument to inject arbitrary SQL statements. The vulnerability is remotely exploitable and requires no authentication or user interaction. A public exploit has been released, and the vendor has confirmed the flaw while planning a technical fix. The weakness is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Critical Impact
Unauthenticated remote attackers can inject SQL statements through the mail log interface, potentially exposing configuration data, credentials, and firewall policy information.
Affected Products
- H3C SecPath F1000-C8300 firewall appliance
- Firmware builds up to and including 20260522
- Web management interface component handling log_fw_nbc_mail_jsondata
Discovery Timeline
- 2026-07-16 - CVE-2026-15907 published to NVD
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-15907
Vulnerability Analysis
The vulnerability affects the mail log JSON data handler within the H3C SecPath F1000-C8300 web user interface. When a client submits a request to /webui/?g=log_fw_nbc_mail_jsondata, the backend processes the subject parameter without applying proper input neutralization. An attacker can supply crafted SQL syntax in this parameter to alter query logic executed against the underlying database.
Because the endpoint is reachable over the network and does not require credentials, the barrier to exploitation is low. Successful injection can disclose stored records, including log metadata and administrative configuration values. Depending on database privileges, an attacker may also modify records or extract session artifacts to escalate access to the appliance.
Root Cause
The root cause is improper neutralization of user-controlled input passed to a downstream SQL interpreter. The subject argument is concatenated into a query string rather than bound as a parameter. This design pattern permits injection whenever attacker input contains SQL control characters such as single quotes, comment markers, or UNION keywords.
Attack Vector
Exploitation occurs remotely over HTTP or HTTPS against the appliance management interface. An attacker crafts a GET or POST request to the vulnerable endpoint with a malicious subject value. No prior authentication is required. Because H3C SecPath F1000-C8300 devices are typically deployed at network perimeters, exposure of the management interface to untrusted networks significantly increases exploitability. The vulnerability details are documented in the VulDB CVE-2026-15907 entry and referenced in the Feishu technical write-up.
The vulnerability manifests in the request handler for the mail log endpoint. See the VulDB Vulnerability #379367 advisory for technical details.
Detection Methods for CVE-2026-15907
Indicators of Compromise
- HTTP requests to /webui/?g=log_fw_nbc_mail_jsondata containing SQL metacharacters such as ', --, UNION, or SLEEP( in the subject parameter.
- Anomalous outbound database query patterns or unusually large response payloads from the firewall management interface.
- Unexpected administrative sessions or configuration changes on the SecPath appliance following external HTTP access.
Detection Strategies
- Deploy web application firewall or IDS signatures that inspect query strings targeting the log_fw_nbc_mail_jsondata handler.
- Correlate access logs from the H3C management interface with source IP reputation data to flag scanning behavior.
- Baseline normal request frequency to the /webui/ path and alert on statistical deviations.
Monitoring Recommendations
- Forward firewall management interface access logs to a central log platform for retention and query.
- Monitor authentication and audit logs on the SecPath device for administrative actions originating from unfamiliar IP ranges.
- Track the VulDB advisory for updates on additional indicators or exploit variants.
How to Mitigate CVE-2026-15907
Immediate Actions Required
- Restrict access to the SecPath F1000-C8300 web management interface to trusted administrative networks only.
- Block inbound HTTP and HTTPS traffic to the /webui/ path from untrusted sources at upstream network devices.
- Audit recent access logs for requests to log_fw_nbc_mail_jsondata and investigate any suspicious subject parameter values.
- Rotate administrative credentials if evidence of exploitation is found.
Patch Information
At publication time, H3C has confirmed the vulnerability and stated that a technical fix is planned. No patched firmware build is listed in the enriched data. Monitor the H3C security advisory channel and the VulDB CVE-2026-15907 record for release announcements, and apply firmware updates as soon as they become available.
Workarounds
- Place the management interface behind a VPN or bastion host that enforces multi-factor authentication.
- Apply source IP allowlists on the appliance to restrict which hosts can reach the web UI.
- Deploy an intrusion prevention signature that blocks requests containing SQL injection payloads targeting the subject parameter.
- Disable external exposure of the management interface until vendor firmware addressing CVE-2026-15907 is installed.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
