CVE-2016-20052: Snews CMS 1.7 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to uplo

Q: How do I fix CVE-2016-20052?

snews: upgrade to newer than 1.7. Exact commands for each OS are on this page.

Q: Is CVE-2016-20052 being exploited?

CVE-2016-20052 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-20052 affect?

CVE-2016-20052 affects snews. Severity is critical (CVSS 9.8). Snews CMS 1.7 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to upload arbitrary files including PHP executables to the snews_files directory. Attackers can upload malicious PHP files through the mu

Q: How urgent is CVE-2016-20052?

Priority 63/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2016-20052 is a critical-severity flaw (CVSS 9.8) affecting snews. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Snews CMS 1.7 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to upload arbitrary files including PHP executables to the snews_files directory. Attackers can upload malicious PHP files through the multipart form-data upload endpoint and execute them by accessing the uploaded file path to achieve remote code execution.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-04-04
Last modified	2026-07-21

Publisher (CNA): VulnCheck · Vendor: snewscms

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-04 14:16 UTCPublished CVE record published
2026-07-21 07:10 UTCUpdated Record last modified

snewscms snews UPGRADE

Affected: <= 1.7

Fixed in: newer than 1.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy snews || rpm -q snews || snews --version

2. UPGRADE to newer than 1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade snews

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade snews

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · python-googleapis-common-protos · FIXED · 1.75.5-1.fc46~bootstrap · FEDORA-2026-d911c4c4e6 · source

sudo dnf upgrade --advisory=FEDORA-2026-d911c4c4e6

Fedora ELN · see advisory · FIXED · FEDORA-2026-e3987c278f · source

sudo dnf upgrade --advisory=FEDORA-2026-e3987c278f

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/40706

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-20052?

snews: upgrade to newer than 1.7. Exact commands for each OS are on this page.

Is CVE-2016-20052 being exploited?

CVE-2016-20052 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-20052 affect?

CVE-2016-20052 affects snews. Severity is critical (CVSS 9.8). Snews CMS 1.7 contains an unrestricted file upload vulnerability that allows unauthenticated attackers to upload arbitrary files including PHP executables to the snews_files directory. Attackers can upload malicious PHP files through the mu

How urgent is CVE-2016-20052?

Priority 63/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2016-20051 MEDIUM 5.3 UPGRADE Snews CMS 1.7 contains a cross-site request forgery vulnerability that allows attackers to change administrato

References

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