Which versions of PHP are affected by CVE-2026-3261?

A critical vulnerability in itsourcecode School Management System 1.0 allows unauthorized access to system settings with a public exploit actively available.

Is there a public PoC exploit available for CVE-2026-3261?

Yes, a public proof-of-concept exploit is available for CVE-2026-3261. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-3261?

Within 24 hours: Isolate affected systems from production networks or restrict access to /settings/index.php via firewall rules. Within 7 days: Conduct a complete audit of setting changes and account access logs to detect exploitation; contact itsourcecode for security guidance. Within 30 days: Migrate to a patched version when available or replace the application with a supported alternative if the vendor does not release a timely security update.

PHP CVE-2026-3261

Q: What is the CVSS score of CVE-2026-3261?

CVE-2026-3261 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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: 0.0%.

MEDIUM

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)

2026-02-26 cna@vuldb.com

PHP SQLi

5.5

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

HIGH MEDIUM

CVSS changed

Apr 29, 2026 - 01:11 NVD

7.3 (HIGH) 5.5 (MEDIUM)

Analysis Generated

Mar 12, 2026 - 21:56 vuln.today

PoC Detected

Feb 27, 2026 - 16:20 vuln.today

Public exploit code

CVE Published

Feb 26, 2026 - 22:20 nvd

HIGH 7.3

DescriptionCVE.org

A flaw has been found in itsourcecode School Management System 1.0. This impacts an unknown function of the file /settings/index.php of the component Setting Handler. This manipulation of the argument ID causes sql injection. The attack may be initiated remotely. The exploit has been published and may be used.

AnalysisAI

SQL injection in itsourcecode School Management System 1.0 via the ID parameter in /settings/index.php allows unauthenticated remote attackers to manipulate database queries and potentially read or modify sensitive data. Public exploit code exists for this vulnerability, and no patch is currently available. …

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Risk assessment & exploitation conditions
Attack chain visualization
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send HTTP request to /settings/index.php

Exploit

Inject SQL payload in ID parameter

Execution

Execute arbitrary SQL queries

Impact

Extract sensitive data from database

Access

Send HTTP request to /settings/index.php

Exploit

Inject SQL payload in ID parameter

Execution

Execute arbitrary SQL queries

Impact

Extract sensitive data from database

Vulnerability AssessmentAI

Exploitation	No special conditions — remote unauthenticated exploitation against default itsourcecode School Management System 1.0 installations with /settings/index.php accessible without authentication. Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 7.3 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Isolate affected systems from production networks or restrict access to /settings/index.php via firewall rules. …

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-3261 vulnerability details – vuln.today

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PHP CVE-2026-3261

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

More from same product – last 7 days

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External POC / Exploit Code