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Cotonti CVE-2026-55744

| EUVDEUVD-2026-37855 HIGH
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-06-18 TuranSec GHSA-wx35-cv59-9gwr
File Upload CSRF PHP Cotonti
8.6
CVSS 4.0 · Vendor: TuranSec
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Severity by source

Vendor (TuranSec) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/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
vuln.today AI
7.1 HIGH

Network-reachable forged POST, no attacker auth (PR:N), victim must click/visit (UI:R); high integrity from arbitrary file write to victim PFS, low confidentiality (uploaded content may be retrievable), no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

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:N/SC:N/SI:N/SA:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

4
Analysis Updated
Jun 18, 2026 - 08:45 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 18, 2026 - 08:37 vuln.today
cvss_changed
CVSS changed
Jun 18, 2026 - 08:37 NVD
8.1 (HIGH) 8.6 (HIGH)
Analysis Generated
Jun 18, 2026 - 08:02 vuln.today

DescriptionCVE.org

Cotonti 1.0.0 (master branch, commit f43f1fc3) is vulnerable to Cross-Site Request Forgery in the Personal File Storage (PFS) module. In modules/pfs/inc/pfs.main.php, the file upload action ('a=upload') processes uploaded files without calling cot_check_xg() to validate the anti-CSRF token, even though sibling actions such as 'delete' (line 272) do. A remote attacker who lures an authenticated user into visiting a malicious page can force the browser to submit a forged multipart request that uploads arbitrary files into the victim's PFS storage.

AnalysisAI

Cross-Site Request Forgery in the Personal File Storage (PFS) module of Cotonti 1.0.0 (commit f43f1fc3) allows remote attackers to upload arbitrary files into an authenticated victim's storage by luring them to a malicious page. The 'a=upload' action in modules/pfs/inc/pfs.main.php omits the cot_check_xg() anti-CSRF token check that sibling actions like 'delete' enforce. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify Cotonti site with PFS enabled
Delivery
Host page with auto-submitting multipart form targeting pfs.php?a=upload
Exploit
Lure authenticated victim to page (phishing/link)
Execution
Browser submits forged POST with session cookie
Persist
Upload handler skips cot_check_xg() and accepts file
Impact
Arbitrary file written to victim's PFS storage
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Vulnerability AssessmentAI

Exploitation Exploitation requires (1) the target Cotonti instance to have the Personal File Storage (PFS) module enabled and accessible at its standard entry point, (2) a victim who is currently authenticated to that Cotonti site, and (3) that victim to load attacker-controlled HTML in the same browser (UI:P - passive interaction such as clicking a link or viewing a page with an auto-submitting form). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N) yields a base score of 8.6 driven by network reach, low complexity, no attacker authentication, and high confidentiality/integrity impact on the user's PFS contents; the UI:P (passive user interaction) accurately reflects that the victim must visit a hostile page while logged in. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker publishes a webpage containing an auto-submitting HTML form that POSTs a multipart/form-data body with arbitrary file content to the target Cotonti site's pfs.php?a=upload endpoint. A logged-in Cotonti user is lured to the page (phishing link, malicious ad, forum embed); their browser silently attaches the session cookie and the upload completes, planting attacker-chosen files in the victim's PFS storage that can later be referenced, exhausted for quota abuse, or chained with any downstream file-handling weakness.
Remediation No vendor-released patch identified at time of analysis - references point only to the vulnerable source file and the project repository, not to a tagged fix release. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all systems running Cotonti 1.0.0 and disable the Personal File Storage upload function if operationally feasible. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-55744 vulnerability details – vuln.today
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