Espocrm
CVE-2025-52892
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V4 - API and Web Service HTTP request consistency
|
| Impact | CVSS score of 4.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, high privileges required, user interaction required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.04%. |
| Exploit ScenarioDerived | A remote attacker could manipulate HTTP request interpretation between frontend and backend servers by sending crafted requests to the affected application. |
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Alert meAnalysisAIv1 – Mar 28, 2026
EspoCRM is a web application with a frontend designed as a single-page application and a REST API backend written in PHP. Rated medium severity (CVSS 4.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Enforce strict HTTP parsing, normalize requests at proxy layer, use HTTP/2 end-to-end, reject ambiguous headers.
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Technical ContextAI · show details
This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444), which allows attackers to manipulate HTTP request interpretation between frontend and backend servers. EspoCRM is a web application with a frontend designed as a single-page application and a REST API backend written in PHP. In versions 9.1.6 and below, if a user loads Espo in the browser with double slashes (e.g https://domain//#Admin) and the webserver does not strip the double slash, it can cause a corrupted Slim router's cache. This will make the instance unusable until there is a completed rebuild. This is fixed in version 9.1.7. Affected products include: Espocrm. Version information: version 9.1.7..
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
EspoCRM is a web application with a frontend designed as a single-page application and a REST API backend written in PHP. In versions 9.1.6 and below, if a user loads Espo in the browser with double slashes (e.g https://domain//#Admin) and the webserver does not strip the double slash, it can cause a corrupted Slim router's cache. This will make the instance unusable until there is a completed rebuild. This is fixed in version 9.1.7.
Executive ViewAI
Organizations using PHP. In should be aware of moderate risk from CVE-2025-52892 rated CVSS 4.5. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
HTTP request smuggling exploits inconsistencies in how front-end and back-end servers parse HTTP message boundaries.
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)GitHub Advisory
Directory traversal vulnerability in EspoCRM before 2.6.0 allows remote attackers to include and execute arbitrary local
Path traversal in EspoCRM's formula scripting engine allows authenticated administrators to achieve arbitrary file read/
PHP object deserialization in EspoCRM versions prior to 9.3.7 lets an authenticated administrator achieve remote code ex
EspoCRM version 7.1.8 is vulnerable to Unrestricted File Upload allowing attackers to upload malicious file with any ext
EspoCRM 5.6.4 is vulnerable to user password hash enumeration. Rated high severity (CVSS 8.8), this vulnerability is rem
Authorization bypass in EspoCRM 5.8.5 lets an authenticated low-privilege user reuse or manipulate Basic-Authorization a
EspoCRM deployments before 10.0.5 allow an authenticated user with Email Account scope to retrieve other users' stored I
CSV Injection in Create Contacts in EspoCRM 7.1.8 allows remote authenticated users to run system commands via creating
Boolean-based blind SQL injection in EspoCRM versions 8.1.0 through 9.3.7 allows an authenticated non-administrator to i
Path traversal in EspoCRM admin template management allows authenticated administrators to read, create, overwrite, or d
Server-side request forgery in EspoCRM before 10.0.4 allows authenticated users to route outbound HTTP requests to inter
Stored cross-site scripting in EspoCRM 9.3.3 and below enables an authenticated attacker to execute arbitrary JavaScript
GitHub PoC
Exploit-DB