CVE-2026-2551: A vulnerability was determined in ZenTao up to 21.7.8

Q: How do I fix CVE-2026-2551?

zentao: upgrade to newer than 21.7.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-2551 being exploited?

CVE-2026-2551 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-2026-2551 affect?

CVE-2026-2551 affects zentao. Severity is medium (CVSS 5.4). A vulnerability was determined in ZenTao up to 21.7.8. Affected by this vulnerability is the function delete of the file editor/control.php of the component Backup Handler. This manipulation of the argument fileName causes path traversal. I

Q: How urgent is CVE-2026-2551?

Priority 35/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2026-2551 is a medium-severity flaw (CVSS 5.4) affecting zentao. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was determined in ZenTao up to 21.7.8. Affected by this vulnerability is the function delete of the file editor/control.php of the component Backup Handler. This manipulation of the argument fileName causes path traversal. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-02-16
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: zentao

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

Am I affected?

Timeline

2026-02-16 11:15 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

zentao zentao UPGRADE

Affected: <= 21.7.8

Fixed in: newer than 21.7.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 21.7.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zentao

Note

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

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-2026-2551?

zentao: upgrade to newer than 21.7.8. Exact commands for each OS are on this page.

Is CVE-2026-2551 being exploited?

CVE-2026-2551 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-2026-2551 affect?

CVE-2026-2551 affects zentao. Severity is medium (CVSS 5.4). A vulnerability was determined in ZenTao up to 21.7.8. Affected by this vulnerability is the function delete of the file editor/control.php of the component Backup Handler. This manipulation of the argument fileName causes path traversal. I

How urgent is CVE-2026-2551?

Priority 35/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-13789 MEDIUM 6.3 UPGRADE A vulnerability was found in ZenTao up to 21.7.6-8564
CVE-2025-13787 MEDIUM 5.4 UPGRADE A flaw has been found in ZenTao up to 21.7.6-8564
CVE-2026-2552 MEDIUM 5.5 UPGRADE A vulnerability was identified in ZenTao up to 21.7.8
CVE-2026-1884 MEDIUM 4.7 UPGRADE A weakness has been identified in ZenTao up to 21.7.6-85642
CVE-2025-5114 MEDIUM 6.3 DOWNGRADE A vulnerability has been found in easysoft zentaopms 21.5_20250307 and classified as critical

References

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