EUVD-2026-39459
GHSA-mhrm-pq8h-qmf3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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
Network endpoint with low complexity but requires an authenticated low-privileged account (PR:L); file relocation harms integrity and availability (I:H/A:H) without direct read access (C:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/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
Lifecycle Timeline
1DescriptionCVE.org
HTMLy CMS through 3.1.1 contains a path traversal vulnerability that allows low-privileged authenticated attackers to relocate arbitrary files by supplying directory traversal sequences in the oldfile parameter at the admin autosave endpoint. Attackers can pass unsanitized traversal sequences directly to file_exists() and rename() functions in admin.php without canonicalization or directory boundary enforcement to cause unintended relocation of any file writable by the web server process to an attacker-specified draft location.
Articles & Coverage 1
AnalysisAI
Arbitrary file relocation in HTMLy CMS through version 3.1.1 allows low-privileged authenticated users to move any web-server-writable file by injecting directory traversal sequences into the oldfile parameter of the admin autosave endpoint. Reported by VulnCheck with publicly available exploit code, the flaw stems from passing unsanitized input directly to file_exists() and rename() in admin.php. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated low-privileged HTMLy account (PR:L) with access to the admin autosave endpoint in admin.php, and the ability to supply a crafted oldfile parameter containing directory traversal sequences. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N, base 7.2 High) is internally consistent with the description: network-reachable, low complexity, requires low privileges (an authenticated low-privileged account), no user interaction, and high integrity and availability impact with no confidentiality loss - appropriate for a file-relocation primitive that can corrupt or remove files but does not directly read them. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged author logs into an internet-facing HTMLy site and sends a crafted autosave request setting oldfile to a traversal path such as ../../config/something, causing rename() to move a sensitive or operational file out of place. Using the publicly available POC, the attacker corrupts site content or relocates files the web server can write, degrading integrity and availability of the CMS. |
| Remediation | No vendor-released patch version is identified at time of analysis, so confirm the current fixed release directly with the maintainer via the project's GitHub (danpros/htmly) and the VulnCheck advisory at https://www.vulncheck.com/advisories/htmly-cms-path-traversal-via-oldfile-parameter-in-autosave before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
WITHIN 24 HOURS: Identify all systems running HTMLy CMS through version 3.1.1; restrict administrative access to VPN/trusted networks only; review recent file system activity for suspicious file relocations. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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