Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318 Firmware Upgrade /cgi-bin/upgrade upgradeFile data authenticity

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.6$0-$5k0.00+

Summaryinfo

A vulnerability was found in Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318. It has been classified as very critical. Affected by this issue is some unknown functionality of the file /cgi-bin/upgrade of the component Firmware Upgrade Handler. Performing a manipulation of the argument upgradeFile results in data authenticity. This vulnerability is known as CVE-2026-129258. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318. This affects an unknown code block of the file /cgi-bin/upgrade of the component Firmware Upgrade Handler. The manipulation of the argument upgradeFile with an unknown input leads to a data authenticity vulnerability. CWE is classifying the issue as CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. This is going to have an impact on confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-129258. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details and a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026).

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.6

VulDB Base Score: 9.1
VulDB Temp Score: 8.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Data authenticity
CWE: CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/13/2026 Advisory disclosed
11/13/2026 +0 days VulDB entry created
11/13/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: tenda.com.cn

Advisory: github.com
Status: Confirmed

CNA: VulDB
CVE: CVE-2026-129258 (🔒)

GCVE (CVE): GCVE-0-2026-129258
GCVE (VulDB): GCVE-100-437295
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/13/2026 21:02
Changes: 11/13/2026 21:02 (57)
Complete: 🔍
Submitter: Longqxxixi
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #1043033: Tenda AC18 (AC18V1.0BR) wireless router V15.03.05.05_multi ,V15.03.05.19 build 6318 Insufficient Verification of Data Authenticity (by Longqxxixi)

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