CVE-2025-41347: Unlimited upload vulnerability for dangerous file types in WinPlus v24.11.27 from Informática del Este

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-41347 is a critical-severity flaw (CVSS 9.8) affecting winplus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unlimited upload vulnerability for dangerous file types in WinPlus v24.11.27 from Informática del Este. This vulnerability allows an attacker to upload a 'webshell' by sending a POST request to '/WinplusPortal/ws/sWinplus.svc/json/uploadfile'.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-11-18
Last modified	2026-10-18

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: iest

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-18 11:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

iest winplus DOWNGRADE

Affected: 24.11.27

Fixed in: no fixed release known

Safe to downgrade to: a release before 24.11.27

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 24.11.27 (Debian / Ubuntu)

apt-cache madison winplus sudo apt install winplus=<VERSION_BEFORE_24.11.27> sudo apt-mark hold winplus

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list winplus sudo dnf downgrade winplus-<VERSION_BEFORE_24.11.27> sudo dnf versionlock add winplus

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-41347?

winplus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-41347 being exploited?

CVE-2025-41347 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-2025-41347 affect?

CVE-2025-41347 affects winplus. Severity is critical (CVSS 9.8). Unlimited upload vulnerability for dangerous file types in WinPlus v24.11.27 from Informática del Este. This vulnerability allows an attacker to upload a 'webshell' by sending a POST request to '/WinplusPortal/ws/sWinplus.svc/json/uploadfi

How urgent is CVE-2025-41347?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-41348 CRITICAL 9.8 DOWNGRADE SQL injection vulnerability in WinPlus v24.11.27 by Informática del Este
CVE-2025-41346 CRITICAL 9.8 DOWNGRADE Faulty authorization control in software WinPlus v24.11.27 by Informática del Este that allows another user to
CVE-2025-41349 MEDIUM 5.4 DOWNGRADE Stored Cross-site Scripting (XSS)vylnerability type in WinPlus v24.11.27 byInformática del Este that consist o
CVE-2025-41350 MEDIUM 5.4 DOWNGRADE Stored Cross-site Scripting (XSS)vylnerability type in WinPlus v24.11.27 byInformática del Este that consist o

References

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