CVE-2026-27512Network attack vector

Reflected script execution via MIME sniffing

Published Feb 23, 2026 · Updated Feb 23, 2026

Content-type confusion in F3 firmware 12.01.01.55_multi allows remote attackers to execute reflected script in the administrative interface. The interface reflects attacker-influenced content in response bodies while omitting X-Content-Type-Options: nosniff, allowing browsers to treat the data as active HTML. Exploitation requires a user to open the crafted response in a browser with the affected MIME-sniffing behavior, and script execution occurs in the interface's origin.

CVSS severity5.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Content-type confusion in F3 firmware 12.01.01.55_multi allows remote attackers to execute reflected script in the administrative interface. The interface reflects attacker-influenced content in response bodies while omitting X-Content-Type-Options: nosniff, allowing browsers to treat the data as active HTML. Exploitation requires a user to open the crafted response in a browser with the affected MIME-sniffing behavior, and script execution occurs in the interface's origin.

The record

CVE
CVE-2026-27512
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
F3
Classifications
CWE-116, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 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=0 <=12.01.01.55_multi

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · F3version=0 <=12.01.01.55_multi

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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