Persistent Cross-Site Scripting in Grav CMS Admin Plugin
CVE-2020-36955

5.1MEDIUM

Key Information:

Vendor

Getgrav

Status
Grav Cms Admin Plugin
Vendor
CVE Published:
26 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-36955?

Grav CMS 1.6.30, when used with Admin Plugin version 1.9.18, is susceptible to a persistent cross-site scripting (XSS) vulnerability. This security flaw enables authenticated attackers to inject harmful scripts via the page title field. Once a new page is created with a malicious title, the script will execute when the page is accessed in the admin panel or publicly on the site, potentially compromising user data and site integrity.

Affected Version(s)

Grav CMS Admin Plugin 0 <= 1.9.18

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-36955 - Proof of Concept

References

https://www.exploit-db.com/exploits/49264
exploit
https://getgrav.org/
product
https://www.vulncheck.com/advisories/grav-cms-admin-plugi...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sagar Banwa
.