EUVD-2026-37854
GHSA-7g3p-35vc-mgjr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker is unauthenticated (PR:N) but needs victim admin to click (UI:R); forged request crosses trust boundary into admin context (S:C) with full C/I/A impact via template-driven RCE.
Primary rating from Vendor (TuranSec).
CVSS VectorVendor: TuranSec
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the administration rights handler. In system/admin/admin.rights.php, the rights update action ('a=update') modifies group access rights (including via cot_auth_add_group) without calling cot_check_xg() to validate the anti-CSRF token. A remote attacker who lures an authenticated administrator into visiting a malicious page can force the browser to submit a forged request that grants elevated permissions to an attacker-controlled group, escalating privileges to administrator. Because Cotonti administrators can modify templates and configuration, this can be further leveraged toward remote code execution.
Articles & Coverage 1
AnalysisAI
Cross-site request forgery in Cotonti 1.0.0 (commit f43f1fc3) lets a remote attacker escalate privileges to administrator by tricking a logged-in admin into loading an attacker-controlled page that submits a forged rights-update request to system/admin/admin.rights.php. Because Cotonti administrators can edit templates and configuration, the resulting account can be pivoted to remote code execution on the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) a target Cotonti 1.0.0 instance running the unpatched system/admin/admin.rights.php update handler, (2) an active authenticated administrator session in the victim's browser at the moment the malicious page is loaded, and (3) victim interaction in the form of visiting an attacker-controlled URL (UI:P in the CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 9.4 is driven by AV:N, AC:L, PR:N, UI:P with full vulnerable- and subsequent-system C/I/A impact, which is consistent with the description: the attacker themselves is unauthenticated, but the victim (an administrator) must passively visit a malicious page, captured by UI:P. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a page containing an auto-submitting HTML form (or an image tag for a GET variant) targeting /system/admin/admin.rights.php?a=update with parameters that add an attacker-controlled group to the administrator rights set, and lures a logged-in Cotonti administrator to it via a phishing email, forum link, or watering-hole comment. The victim's browser silently submits the request with their session cookie, the server grants admin rights to the attacker's account, and the attacker then logs in and edits a Cotonti template to inject PHP, achieving remote code execution on the host. |
| Remediation | No vendor-released patch identified at time of analysis; operators should monitor https://github.com/Cotonti/Cotonti for an upstream commit that adds a cot_check_xg() call (or equivalent xg-token validation) to the 'a=update' branch of system/admin/admin.rights.php and apply it as soon as it is tagged. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Cotonti 1.0.0 deployments and notify administrators to be vigilant against suspicious requests to confirm administrative privileges. …
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External POC / Exploit Code
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