How severe is CVE-2017-8298?

CVE-2017-8298 has a CVSS score of 5.4/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2017-8298?

CVE-2017-8298 affects the following packages: austintoddj/canvas (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2017-8298?

The records we use list no patched version of austintoddj/canvas for CVE-2017-8298. 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-2017-8298 in my Packagist dependencies?

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

How do I mitigate CVE-2017-8298 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-2017-8298 actively exploited in the wild?

No public exploit code has been indexed for CVE-2017-8298 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2017-8298?

CVE-2017-8298 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 50th 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-2017-8298?

CVE-2017-8298 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-2017-8298 published, and has it been updated?

CVE-2017-8298 was published on April 27, 2017 and was last updated on October 20, 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-2017-8298 — canvas

MEDIUM

CVE-2017-8298 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in austintoddj/canvas. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Canvs Canvas Cross-site Scripting (XSS) via title and content fields

Also known asGHSA-3657-q433-mmpx

Published

Apr 27, 2017

Updated

Oct 20, 2026

Affected

1 pkg

Patched

See advisory

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk-0.00%

Lower risk than most CVEs50th percentile — riskier than 50% 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

🐘austintoddj/canvas

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

cnvs.io Canvas 3.3.0 has XSS in the title and content fields of a "Posts > Add New" action, and during creation of new tags and users.

Affected Packages

1 total

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

Affected Products

1 product · 1 configurations

Application

canvascnvs

1 version

3.3.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for austintoddj/canvas, 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 austintoddj/canvas for CVE-2017-8298. 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

cnvs.io Canvas 3.3.0 has XSS in the title and content fields of a "Posts > Add New" action, and during creation of new tags and users.

O3 Security · Impact-Aware SCA

Is CVE-2017-8298 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

5.4/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Apr 27, 2017

Last updated

Oct 20, 2026

Identifiers

CVE-2017-8298

GHSA-3657-q433-mmpx

References

Advisorynvd.nist.gov · CVE 2017 8298 Fixgithub.com Packagegithub.com · canvas

Related vulnerabilities

Also affects austintoddj/canvas

This CVE is medium severity, in line with the other 1 CVE affecting austintoddj/canvas.

CVE-2017-1000507

Same weakness: CWE-79

This CVE is medium severity; 7 of 7 other CVEs with CWE-79 are rated as high or higher (top: critical).

CVE-2026-113787CVE-2026-44267CVE-2026-96632CVE-2026-9086CVE-2026-118246CVE-2026-118251CVE-2026-118253Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026