MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt applicat...
Vendor
MaxSite vulnerabilities
19 published CVES affecting MaxSite, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).
- Total
- 19
- Critical
- 5
- High
- 2
- Medium
- 12
- Low
- 0
- Unscored
- 0
- CISA KEV
- 0
Products
Latest MaxSite CVEs
Newest publication first
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CriticalCVSS 9.2 EPSS 0.61%
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CVE-2026-87929 MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
PublishedCriticalCVSS 9.3 EPSS 0.53%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 adm...
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MediumCVSS 5.1 EPSS 0.30%
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in vi...
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HighCVSS 8.8 EPSS 0.59%
MaxSite CMS through 109.6 contains a local file inclusion vulnerability in the ajax and require-maxsite dispatchers that allows unauthenticated attackers to execute privileged handler files by supplying base64-encoded path traversal sequences. Attackers can bypass path validation...
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CVE-2026-70554 MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie
PublishedCriticalCVSS 9.3 EPSS 1.2%MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can...
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CriticalCVSS 9.3 EPSS 1.3%
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a...
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CriticalCVSS 9.3 EPSS 0.83%
MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php fil...
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MediumCVSS 4.8 EPSS 0.22%
A vulnerability was found in MaxSite CMS up to 109.3. Impacted is an unknown function of the component ushki Plugin. Performing a manipulation of the argument f_ushka_new/f_ushk results in cross site scripting. Remote exploitation of the attack is possible. The exploit has been m...
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MediumCVSS 4.8 EPSS 0.22%
A vulnerability has been found in MaxSite CMS up to 109.3. This issue affects some unknown processing of the component Guestbook Plugin. Such manipulation of the argument f_text/f_slug/f_limit/f_email leads to cross site scripting. The attack may be launched remotely. The exploit...
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MediumCVSS 4.8 EPSS 0.27%
A flaw has been found in MaxSite CMS up to 109.3. This vulnerability affects unknown code of the component down_count Plugin. This manipulation of the argument f_file/f_prefix causes cross site scripting. The attack may be initiated remotely. The exploit has been published and ma...
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MediumCVSS 4.8 EPSS 0.22%
A security vulnerability has been detected in MaxSite CMS up to 109.3. Affected by this issue is some unknown functionality of the component mail_send Plugin. The manipulation of the argument f_subject/f_files/f_from leads to cross site scripting. The attack can be initiated remo...
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MediumCVSS 4.8 EPSS 0.29%
A vulnerability was detected in MaxSite CMS up to 109.3. This affects an unknown part of the component Redirect Plugin. The manipulation of the argument f_all/f_all404 results in cross site scripting. The attack can be launched remotely. The exploit is now public and may be used....
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MediumCVSS 4.8 EPSS 0.27%
A weakness has been identified in MaxSite CMS up to 109.3. Affected by this vulnerability is an unknown functionality of the file /admin/plugin_antispam of the component Antispam Plugin. Executing a manipulation of the argument f_logging_file can lead to cross site scripting. It...
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CVE-2026-3395 MaxSite CMS MarkItUp Preview AJAX Endpoint preview-ajax.php eval code injection
PublishedMediumCVSS 6.9 EPSS 4.0%A flaw has been found in MaxSite CMS up to 109.1. This impacts the function eval of the file application/maxsite/admin/plugins/editor_markitup/preview-ajax.php of the component MarkItUp Preview AJAX Endpoint. Executing a manipulation can lead to code injection. It is possible to...
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MediumCVSS 5.3 EPSS 0.40%
A flaw has been found in MaxSite CMS up to 109. This issue affects some unknown processing of the file application/maxsite/admin/plugins/editor_files/save-file-ajax.php. Executing manipulation of the argument file_path/content can lead to unrestricted upload. The attack can be ex...
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MediumCVSS 5.3 EPSS 0.40%
A vulnerability was detected in MaxSite CMS up to 109. This vulnerability affects unknown code of the file application/maxsite/admin/plugins/auto_post/uploads-require-maxsite.php of the component HTTP Header Handler. Performing manipulation of the argument X-Requested-FileName/X-...
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MediumCVSS 6.1 EPSS 0.49%
Cross Site Scripting vulnerability in Maxsite CMS v.108.7 allows a remote attacker to execute arbitrary code via the f_content parameter in the admin/page_new file.
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MediumCVSS 6.1 EPSS 3.4%
A reflected cross-site scripting (XSS) vulnerability in MaxSite CMS before V106 via product/page/* allows remote attackers to inject arbitrary web script to a page.
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HighCVSS 7.5 EPSS 1.0%
SQL injection vulnerability in index.php in MAXSITE 1.10 and earlier allows remote attackers to execute arbitrary SQL commands via the category parameter in a webboard action.
Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.