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.

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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
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