CVE-2019-19735: class.userpeer.php in MFScripts YetiShare 3.5.2 through 4.5.3 uses an insecure method of creating password res

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2019-19735 is a critical-severity flaw (CVSS 9.1) affecting yetishare. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

class.userpeer.php in MFScripts YetiShare 3.5.2 through 4.5.3 uses an insecure method of creating password reset hashes (based only on microtime), which allows an attacker to guess the hash and set the password within a few hours by bruteforcing.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-916
Published	2019-12-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mfscripts

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-30 17:15 UTCPublished CVE record published
2026-06-17 02:27 UTCUpdated Record last modified

mfscripts yetishare UPGRADE

Affected: >= 3.5.2 and <= 4.5.3

Fixed in: newer than 4.5.3

Safe to downgrade to: a release before 3.5.2

1. Check installed version

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

2. UPGRADE to newer than 4.5.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yetishare

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.5.2 (Debian / Ubuntu)

apt-cache madison yetishare sudo apt install yetishare=<VERSION_BEFORE_3.5.2> sudo apt-mark hold yetishare

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list yetishare sudo dnf downgrade yetishare-<VERSION_BEFORE_3.5.2> sudo dnf versionlock add yetishare

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-2019-19735?

yetishare: upgrade to newer than 4.5.3. Exact commands for each OS are on this page.

Is CVE-2019-19735 being exploited?

CVE-2019-19735 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-2019-19735 affect?

CVE-2019-19735 affects yetishare. Severity is critical (CVSS 9.1). class.userpeer.php in MFScripts YetiShare 3.5.2 through 4.5.3 uses an insecure method of creating password reset hashes (based only on microtime), which allows an attacker to guess the hash and set the password within a few hours by brutefo

How urgent is CVE-2019-19735?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2019-19806 MEDIUM 5.3 UPGRADE _account_forgot_password.ajax.php in MFScripts YetiShare 3.5.2 through 4.5.3 displays a message indicating whe

References

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