Select-mes Zermatt Plugin up to 1.6.1 on WordPress deserialization

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.87

Summaryinfo

A vulnerability categorized as problematic has been discovered in Select-mes Zermatt Plugin up to 1.6.1 on WordPress. Affected is an unknown function. Such manipulation leads to deserialization. This vulnerability is documented as CVE-2026-39545. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Select-mes Zermatt Plugin up to 1.6.1 on WordPress and classified as problematic. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Unauthenticated PHP Object Injection in Zermatt <= 1.6.1 versions.

The weakness was released by Denver Jackson. The advisory is shared for download at patchstack.com. This vulnerability is handled as CVE-2026-39545 since 04/07/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/17/2026).

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (Patchstack): 🔒

CVSSv2info

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

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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

04/07/2026 CVE reserved
06/17/2026 +71 days Advisory disclosed
06/17/2026 +0 days VulDB entry created
06/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: patchstack.com
Researcher: Denver Jackson
Status: Not defined

CVE: CVE-2026-39545 (🔒)
GCVE (CVE): GCVE-0-2026-39545
GCVE (VulDB): GCVE-100-371876

Entryinfo

Created: 06/17/2026 13:34
Changes: 06/17/2026 13:34 (63)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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