How severe is CVE-2018-11564?

CVE-2018-11564 has a CVSS score of 4.8/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2018-11564?

CVE-2018-11564 affects the following packages: pagekit/pagekit (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2018-11564?

The records we use list no patched version of pagekit/pagekit for CVE-2018-11564. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

How do I detect CVE-2018-11564 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pagekit/pagekit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2018-11564 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2018-11564 actively exploited in the wild?

Yes. There are 4 known exploit references for CVE-2018-11564, including 1 documented proof-of-concept exploit on Exploit-DB and 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2018-11564?

CVE-2018-11564 has an EPSS (Exploit Prediction Scoring System) score of 3.1%, placing it in the 88th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2018-11564?

CVE-2018-11564 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2018-11564 published, and has it been updated?

CVE-2018-11564 was published on June 2, 2018 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2018-11564 — pagekit

MEDIUM

CVE-2018-11564 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in pagekit/pagekit. 4 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Pagekit Stored Cross-site Scripting

Also known asGHSA-3rwj-v7jp-w542

Published

Jun 2, 2018

Updated

Oct 24, 2026

Affected

1 pkg

Patched

See advisory

Exploits

4 known

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

3.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs88th percentile — riskier than 88% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐘pagekit/pagekit

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Stored XSS in YOOtheme Pagekit 1.0.13 and earlier allows a user to upload malicious code via the picture upload feature. A user with elevated privileges could upload a photo to the system in an SVG format. This file will be uploaded to the system and it will not be stripped or filtered. The user can create a link on the website pointing to "/storage/poc.svg" that will point to http://localhost/pagekit/storage/poc.svg. When a user comes along to click that link, it will trigger a XSS attack.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`pagekit/pagekit`	all versions	No fix

Affected Products

1 product · 1 configurations

Application

pagekitpagekit

≤ 1.0.13

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-44837webappsphp

Pagekit < 1.0.13 - Cross-Site Scripting Code Generator

by DEEPIN2 · Jun 5, 2018

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pagekit/pagekit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of pagekit/pagekit for CVE-2018-11564. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2018-11564 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

4.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template or Metasploit module yet. 4 public proof-of-concept references are listed on this page.

OpenSSF Scorecard

Package health score

pagekit

1.9/10

Maintained0/10

Code-Review1/10

Branch-Protection0/10

Assessed Oct 19, 2026

Timeline

Disclosed

Jun 2, 2018

First exploit

Jun 5, 2018

3 days after disclosure — rapid exploitation

Last updated

Oct 24, 2026

Identifiers

CVE-2018-11564

GHSA-3rwj-v7jp-w542

References

Advisorynvd.nist.gov · CVE 2018 11564 Webexploit-db.com Packagegithub.com · pagekit Evidenceruffsecurity.blogspot.com · my first cve found Evidencepacketstormsecurity.com · PageKit CMS 1.0.13 Cross Site Scripting Evidenceexploit-db.com

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting pagekit/pagekit are rated as high or higher (top: critical).

CVE-2025-67164CVE-2025-67165CVE-2024-45967CVE-2023-41005CVE-2022-38916CVE-2022-36573CVE-2019-19013CVE-2019-16669

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026