CVE-2026-9531Public exploitNetwork attack vector

Authenticated command execution via unsanitized FileName

Published May 26, 2026 · Updated May 26, 2026

OS command injection in TOTOLINK CA750-PoE 6.2c.510 allows remote authenticated users to execute arbitrary commands via FileName. The setUpgradeUboot handler in /cgi-bin/cstecgi.cgi passes the attacker-controlled FileName value to an operating-system command without neutralizing shell metacharacters. A valid SESSION_ID cookie is required; the published request starts a shell listener on port 8893, giving authenticated network attackers device-level command execution.

CVSS severity6.3
Medium
EPSS probability10.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in TOTOLINK CA750-PoE 6.2c.510 allows remote authenticated users to execute arbitrary commands via FileName. The setUpgradeUboot handler in /cgi-bin/cstecgi.cgi passes the attacker-controlled FileName value to an operating-system command without neutralizing shell metacharacters. A valid SESSION_ID cookie is required; the published request starts a shell listener on port 8893, giving authenticated network attackers device-level command execution.

The record

CVE
CVE-2026-9531
Published
May 26, 2026
Updated
May 26, 2026
Vendor
TOTOLINK
Product
CA750-PoE
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2c.510

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · CA750-PoEversion=6.2c.510

Published CVSS scores

2.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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