CVE-2025-56676: TitanSystems Zender v3.9.7 contains an account takeover vulnerability in its password reset functionality

Routine

MEDIUM 5.4DOWNGRADE

CVE-2025-56676 is a medium-severity flaw (CVSS 5.4) affecting zender. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TitanSystems Zender v3.9.7 contains an account takeover vulnerability in its password reset functionality. A temporary password or reset token issued to one user can be used to log in as another user, due to improper validation of token-user linkage. This allows remote attackers to gain unauthorized access to any user account by exploiting the password reset mechanism. The vulnerability occurs because the reset token is not correctly bound to the

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-1259
Published	2025-09-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: titansystems

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

Am I affected?

Timeline

2025-09-30 16:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

titansystems zender DOWNGRADE

Affected: 3.9.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.9.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.9.7 (Debian / Ubuntu)

apt-cache madison zender sudo apt install zender=<VERSION_BEFORE_3.9.7> sudo apt-mark hold zender

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

dnf --showduplicates list zender sudo dnf downgrade zender-<VERSION_BEFORE_3.9.7> sudo dnf versionlock add zender

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-2025-56676?

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

Is CVE-2025-56676 being exploited?

CVE-2025-56676 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-2025-56676 affect?

CVE-2025-56676 affects zender. Severity is medium (CVSS 5.4). TitanSystems Zender v3.9.7 contains an account takeover vulnerability in its password reset functionality. A temporary password or reset token issued to one user can be used to log in as another user, due to improper validation of token-use

How urgent is CVE-2025-56676?

Priority 25/100. No elevated risk signals yet.

References

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