Which versions of PHP are affected by CVE-2026-2551?

Organizations using ZenTao should be aware of moderate risk from CVE-2026-2551, a path traversal vulnerability rated CVSS 5.4. This could allow unauthorized file access.

Is there a public PoC exploit available for CVE-2026-2551?

Yes, a public proof-of-concept exploit is available for CVE-2026-2551. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2551?

Within 30 days: Identify affected systems running ZenTao and apply vendor patches as part of regular patch cycle. Review file handling controls.

PHP CVE-2026-2551

Q: What is the CVSS score of CVE-2026-2551?

CVE-2026-2551 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

LOW

Path Traversal (CWE-22)

2026-02-16 cna@vuldb.com

PHP Path Traversal Zentao

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.4 (MEDIUM) 2.1 (LOW)

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 20, 2026 - 19:06 vuln.today

Public exploit code

CVE Published

Feb 16, 2026 - 11:15 nvd

MEDIUM 5.4

DescriptionCVE.org

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.

AnalysisAI

ZenTao versions up to 21.7.8 contain a path traversal vulnerability in the backup handler that allows authenticated attackers to manipulate file parameters and access or delete arbitrary files on the affected system. Public exploit code exists for this vulnerability, and no patch is currently available. The attack requires valid credentials but can be executed remotely without user interaction.

Technical ContextAI

Classified as CWE-22 (Path Traversal). Affects Zentao. 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.

RemediationAI

Monitor vendor advisories for a patch. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.