How severe is CVE-2019-15484?

CVE-2019-15484 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2019-15484?

CVE-2019-15484 affects the following packages: bolt/bolt (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2019-15484?

Update bolt/bolt to 3.6.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-15484 is resolved across your whole dependency graph.

How do I detect CVE-2019-15484 in my Packagist dependencies?

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

How do I mitigate CVE-2019-15484 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-2019-15484 actively exploited in the wild?

No public exploit code has been indexed for CVE-2019-15484 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-2019-15484?

CVE-2019-15484 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 59th 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-2019-15484?

CVE-2019-15484 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-2019-15484 published, and has it been updated?

CVE-2019-15484 was published on August 23, 2019 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-2019-15484 — bolt

MEDIUMFix: bolt/bolt#7801

CVE-2019-15484 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in bolt/bolt. A fix is available for bolt/bolt — see the affected versions and patch details below.

Bolt Cross-site Scripting (XSS) via an image's alt or title field

Also known asGHSA-fp8m-xw3f-6h7x

Published

Aug 23, 2019

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs59th percentile — riskier than 59% 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

🐘bolt/bolt

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

Bolt before 3.6.10 has XSS via an image's alt or title field.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`bolt/bolt`	all versions	3.6.10`composer require bolt/bolt:^3.6.10`

Affected Products

1 product · 1 configurations

Application

boltboltcms

< 3.6.10

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for bolt/bolt, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update bolt/bolt to 3.6.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-15484 is resolved across your whole dependency graph.
Workarounds
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

Bolt before 3.6.10 has XSS via an image's alt or title field.

O3 Security · Impact-Aware SCA

Is CVE-2019-15484 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.0/AV:N/AC:L/PR:N/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.

OpenSSF Scorecard

Package health score

bolt

2.9/10

Code-Review5/10

Maintained0/10

Branch-ProtectionN/A

Assessed Nov 2, 2026

Timeline

Disclosed

Aug 23, 2019

Last updated

Oct 24, 2026

Identifiers

CVE-2019-15484

GHSA-fp8m-xw3f-6h7x

References

Advisorynvd.nist.gov · CVE 2019 15484 Fixgithub.com Reportgithub.com · v3.6.10 Packagegithub.com · bolt

Related vulnerabilities

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

CVE-2025-34086CVE-2024-7300CVE-2019-9553CVE-2019-15483CVE-2017-11128CVE-2017-11127CVE-2018-19933CVE-2019-10874

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026