MaxSite CMS up to 109.6 Session Management config.php is_login hard-coded key

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.46+

Summaryinfo

A vulnerability, which was classified as critical, has been found in MaxSite CMS up to 109.6. This affects the function is_login of the file application/config/config.php of the component Session Management. The manipulation leads to hard-coded key. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is listed as CVE-2026-87929. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, has been found in MaxSite CMS up to 109.6. This issue affects the function is_login of the file application/config/config.php of the component Session Management. The manipulation with an unknown input leads to a hard-coded key vulnerability. Using CWE to declare the problem leads to CWE-321. The use of a hard-coded cryptographic key significantly increases the possibility that encrypted data may be recovered. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-87929 since 09/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1600.001 according to MITRE ATT&CK.

By approaching the search of inurl:application/config/config.php it is possible to find vulnerable targets with Google Hacking.

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

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

Support

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Hard-coded key
CWE: CWE-321 / CWE-320
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒
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

09/09/2026 Advisory disclosed
09/09/2026 +0 days CVE reserved
09/09/2026 +0 days VulDB entry created
09/09/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-87929 (🔒)
GCVE (CVE): GCVE-0-2026-87929
GCVE (VulDB): GCVE-100-401843

Entryinfo

Created: 09/09/2026 19:08
Changes: 09/09/2026 19:08 (78)
Complete: 🔍
Cache ID: 216::103

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