# CVE-2026-9533: Totolink CA750-PoE command injection in recvUpgradeNewFw

Source: https://junglewise.ai/threats/cve-2026-9533-totolink-ca750-poe-command-injection-in-recvupgradenewfw  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-26. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9533 · Severity: medium · CVSS 6.3 · Published 2026-05-26

A security vulnerability exists in the Totolink CA750-PoE router, a device used to provide wireless networking and Power-over-Ethernet capabilities. An attacker can exploit this flaw to take control of the device by executing unauthorized commands. This could lead to a complete compromise of the network traffic passing through the router or a disruption of internet services.

Technologies: [TOTOLINK CA750-PoE](https://junglewise.ai/threats/technologies/ca750-poe). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-9533 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9533 being exploited in the wild.

**How severe is CVE-2026-9533?** Medium severity, with a CVSS score of 6.3, published 26 May 2026.

**Which products and versions are affected?** TOTOLINK CA750-PoE 6.2c.510.

**Is there a fix for CVE-2026-9533?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9533 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-9533?** Check whether you run TOTOLINK CA750-PoE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An OS command injection vulnerability exists in the Totolink CA750-PoE router running firmware version 6.2c.510. The flaw is located within the 'recvUpgradeNewFw' function in the '/cgi-bin/cstecgi.cgi' component (Setting Handler). The vulnerability stems from improper neutralization of special elements in the 'fwUrl' and 'magicid' parameters, which are passed directly to a system shell. A remote attacker with low privileges can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) to execute arbitrary commands on the underlying Linux operating system. A public exploit demonstrating a telnet reverse shell is available.

## Affected products

- Totolink CA750-PoE 6.2c.510

## Timeline

- 2026-05-26: disclosed: Vulnerability disclosed via VulDB and GitHub PoC
- 2026-05-26: advisory: CVE-2026-9533 published

## References

- [https://github.com/wudipjq/my_vuln/blob/main/totolink4/vuln_56/56.md](https://github.com/wudipjq/my_vuln/blob/main/totolink4/vuln_56/56.md)
- [https://vuldb.com/submit/813937](https://vuldb.com/submit/813937)
- [https://vuldb.com/vuln/365560](https://vuldb.com/vuln/365560)
- [https://vuldb.com/vuln/365560/cti](https://vuldb.com/vuln/365560/cti)
- [https://www.totolink.net/](https://www.totolink.net/)

## Related threats

- [Totolink CA750-PoE command injection in setWiFiWpsConfig](https://junglewise.ai/threats/cve-2026-9534-totolink-ca750-poe-command-injection-in-setwifiwpsconfig)
- [Totolink CA750-PoE command injection in setUploadUserData](https://junglewise.ai/threats/cve-2026-9532-totolink-ca750-poe-command-injection-in-setuploaduserdata)
- [Totolink CA750-PoE command injection in setUpgradeUboot](https://junglewise.ai/threats/cve-2026-9531-totolink-ca750-poe-command-injection-in-setupgradeuboot)
- [Totolink CA750-PoE command injection in setUnloadUserData](https://junglewise.ai/threats/cve-2026-9515-totolink-ca750-poe-command-injection-in-setunloaduserdata)
- [TOTOLink CA750-PoE OS command injection in setNetworkDiag](https://junglewise.ai/threats/cve-2026-9514-totolink-ca750-poe-os-command-injection-in-setnetworkdiag)