Threat Intelligence Database

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In versions 4.0.0 through 5.8.0, 3.3.0 through 3.10.6, 2.2.0 through 2.4.6, 2.0.0 through 2.1.17, and all releases up to and including 1.30.5, the WEBSERVICE() domain whitelist can be bypassed via an HTTP redirect (SSRF). In Calculation/Web/Service.php, the webService() method validates a URL's host against the whitelist set via Spreadsheet::setDomainWhiteList(), then fetches content with file_get_contents($url, false, $ctx); because PHP's HTTP stream wrapper follows 301/302 redirects automatically (up to 20 hops) and the redirect target is never re-validated, an attacker who can trigger a redirect from a whitelisted domain can reach arbitrary URLs, including internal addresses. An attacker able to upload XLSX files to an application that uses setDomainWhiteList() and getCalculatedValue() can achieve a full-read SSRF, returning up to 32,767 bytes of the response body as a cell's calculated value, which enables exfiltration of cloud metadata (AWS/GCP/Azure credentials via http://169.254.169.254/), access to internal-only services, and internal port scanning (the port is not validated). This issue has been fixed in versions 5.8.1, 3.10.7, 2.4.7, 2.1.18, and 1.30.6.

# GitHub Security Advisory Draft — GM-374 ## Summary Multiple locations in Pimcore v11 call PHP's `unserialize()` on data from database columns and filesystem files without the `allowed_classes` restriction, enabling object injection if an attacker can control the serialized data source. ## Severity CVSS 3.1: 8.0 (High) — AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H ## Affected Component - **Package:** `pimcore/pimcore` and `pimcore/admin-ui-classic-bundle` - **Files:** - `lib/Tool/Authentication.php` (line 82) — session token deserialization - `models/Site/Dao.php` (line 68) — site domains from database - `models/DataObject/ClassDefinition/CustomLayout/Dao.php` (line 69) — layout definitions from database - `models/Tool/TmpStore/Dao.php` (line 64) — temporary store data from database - `models/Asset/WebDAV/Service.php` (line 36) — delete log from filesystem - `admin-ui-classic-bundle/src/Helper/Dashboard.php` (line 64) — dashboard config from filesystem ## Description Six locations in Pimcore core call `unserialize()` directly (bypassing `Tool\Serialize`) on data sourced from database columns or filesystem files without passing the `allowed_classes` parameter. This means any class available in the autoloader will be instantiated during deserialization. If an attacker can write to the data source (e.g., via SQL injection targeting the `tmp_store`, `sites`, or `custom_layouts` tables, or via a file write vulnerability targeting the WebDAV delete log), they can inject serialized PHP gadget chains that execute arbitrary code when the data is deserialized. This is related to but distinct from the `Tool\Serialize::unserialize()` issue — these calls bypass the wrapper entirely. ## Impact PHP object injection leading to Remote Code Execution when chained with a data source write vulnerability. Pimcore's dependency tree (Guzzle, Symfony, Monolog, Doctrine) provides numerous known gadget chains. ## Proof of Concept 1. Identify a writable data source (e.g., `tmp_store` table via SQL injection, or `webdav-delete.dat` via file write) 2. Write a serialized PHP gadget chain (e.g., Monolog `BufferHandler` chain from phpggc) 3. Trigger the deserialization (e.g., access a page that reads TmpStore, or trigger a WebDAV operation) 4. The gadget chain executes with web server privileges ## Suggested Fix Add `allowed_classes` parameter to all `unserialize()` calls. Where no objects are needed, use `['allowed_classes' => false]`. Consider migrating to JSON serialization for data that doesn't require object preservation. ```php // Example fix for Site/Dao.php: $siteDomains = unserialize($site['domains'], ['allowed_classes' => false]); // Example fix for TmpStore/Dao.php: $item['data'] = unserialize($item['data'], ['allowed_classes' => false]); ``` ## References - CWE-502: Deserialization of Untrusted Data - OWASP Deserialization Cheat Sheet - phpggc: PHP Generic Gadget Chains

My name is Oscar Uribe, Security Researcher at Fluid Attacks. I am reaching out because we have identified a security vulnerability in Pimcore 12.3.3 that we would like to report to you so we can coordinate a responsible disclosure together. As part of our standard disclosure measures, we follow a timeline (outlined at https://fluidattacks.com/advisories/policy), which is aligned with ISO/IEC 29147:2018 and ISO/IEC 30111:2019. In short, the timeline works as follows: we ask for acknowledgment of the report within a few days of your first accessing it, and from there, we are happy to coordinate a joint disclosure date with you, typically within 90 days of the initial discovery. This gives your team reasonable time to assess, develop, and release a fix. We have reserved the CVE ID **"CVE-2026-5394"** for this issue, and the advisory will eventually be published at [https://fluidattacks.com/advisories/dragons](https://fluidattacks.com/advisories/dragons). We are committed to coordinating the timing of that publication with you. Please feel free to reach out if you have any questions about the report, the process, or the timeline. We are glad to work with you on this. ## Description An authenticated administrative user who can import or save DataObject class definitions can inject attacker-controlled composite index metadata and trigger unintended SQL execution in the backend. The vulnerable flow accepts `compositeIndices` from imported JSON, stores the values without strict validation, and later concatenates them directly into `ALTER TABLE ... DROP INDEX` and `ALTER TABLE ... ADD INDEX` statements executed through Doctrine DBAL. Although the original report focused on `compositeIndices.index_key`, independent code review shows that the strongest and most reliable injection point is `compositeIndices.index_columns`, because it is inserted verbatim inside the `ADD INDEX (...)` clause. This permits injection of additional `ALTER TABLE` subclauses against Pimcore object tables without relying on stacked queries. ## Vulnerability ### Root cause 1. Source: - `Pimcore\Model\DataObject\ClassDefinition\Service::importClassDefinitionFromJson()` accepts `compositeIndices` directly from imported JSON. 2. Assignment: - `Pimcore\Model\DataObject\ClassDefinition::setCompositeIndices()` does not enforce an allowlist for index names or column names. - The only special handling is a ManyToOne relation rewrite to `__id` and `__type`, which is not a security control. 3. Sink: - `Pimcore\Model\DataObject\Traits\CompositeIndexTrait::updateCompositeIndices()` builds raw SQL with string concatenation and executes it via `$this->db->executeQuery(...)`. 4. Missing protection: - `quoteIdentifier()` is used for the `SHOW INDEXES` query, but not for the dynamic `ALTER TABLE` statements. - No server-side schema validation restricts `index_key` or `index_columns` to known safe identifier characters. ### Confirmed source-to-sink path 1. `importClassDefinitionFromJson()` decodes attacker-controlled JSON and forwards `compositeIndices`. 2. `setCompositeIndices()` stores those values without sanitizing identifier content. 3. `ClassDefinition::save()` reaches `ClassDefinition\Dao::update()`. 4. `Dao::update()` calls `updateCompositeIndices()` for: - `object_store_<classId>` - `object_query_<classId>` 5. `Localizedfield\Dao` also calls `updateCompositeIndices()` for: - localized query tables - localized store tables ### Why this is exploitable The vulnerable `ADD INDEX` statement is built as: ```php 'ALTER TABLE `'.$table.'` ADD INDEX `' . $key.'` ('.$columnName.');' ``` `$columnName` is produced from `implode(',', $columns)` and is not quoted or validated. A malicious `index_columns` element such as: ```text slider), DROP COLUMN `oo_className` -- ``` produces SQL of the form: ```sql ALTER TABLE `object_query_<id>` ADD INDEX `c_poc_idx` (slider), DROP COLUMN `oo_className` -- ); ``` This remains a single `ALTER TABLE` statement, so the base vulnerability does not depend on multi-statement support. The attacker can inject additional DDL clauses affecting the target Pimcore object table. ### Impact The issue allows a privileged attacker to alter backend SQL behavior during class-definition import/save and modify schema on Pimcore object tables associated with the affected class. Practical impact includes: - unauthorized schema modification on object query/store tables - backend denial of service by breaking expected table layout - data integrity impact for DataObject storage and queries `index_key` is also concatenated into SQL without proper identifier escaping, but the most defensible exploitation path is through `index_columns`. Relevant code: - `models/DataObject/ClassDefinition/Service.php:92-137` - `models/DataObject/ClassDefinition.php:994-1006` - `models/DataObject/Traits/CompositeIndexTrait.php:30-85` - `models/DataObject/ClassDefinition/Dao.php:217-218` - `models/DataObject/Localizedfield/