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CRITICAL severity

CVE-2019-19634 — class.upload.php

CRITICAL

CVE-2019-19634 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability in verot/class.upload.php. 3 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.

class.upload.php in verot.net omits .pht from the set of dangerous file extensions

Also known asGHSA-2gc7-w4hw-rr2m
Published
Updated
Affected
2 pkgs
Patched
See advisory
Exploits
3 known
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
4.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk
0.91%6.67%12.4%18.2%15.0%4.2%Apr 26Aug 26Oct 26

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

2 pkgs affected
🐘verot/class.upload.php🐘verot/class.upload.php

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

class.upload.php in verot.net class.upload through 1.0.3 and 2.x through 2.0.4, as used in the K2 extension for Joomla! and other products, omits .pht from the set of dangerous file extensions, a similar issue to CVE-2019-19576.

Affected Packages

2 total
EcosystemPackageVulnerable rangeFix
🐘Packagistverot/class.upload.phpall versionsNo fix
🐘Packagistverot/class.upload.php≥ 2.0.0No fix

Affected Products

2 products · 3 configurations
Application
k2joomlaworks
≤ 2.10.1
range
Application
verotverot_project
≥ 2.0.0 && < 2.0.4
range
Exploits & PoCs
3

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

class.upload.php in verot.net class.upload through 1.0.3 and 2.x through…

github.comNVDDec 2019

Report on github.com

github.comGithubDec 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    The records we use list no patched version of verot/class.upload.php for CVE-2019-19634. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

class.upload.php in verot.net class.upload through 1.0.3 and 2.x through 2.0.4, as used in the K2 extension for Joomla! and other products, omits .pht from the set of dangerous file extensions, a similar issue to CVE-2019-19576.
O3 Security · Impact-Aware SCA

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CVE-2019-19634: class.upload.php (Critical 9.8)