What is CVE-2026-90851?

CVE-2026-90851 is PHPGurukul Hostel Management System checklogin.php access control. The supplied enrichment data classifies it as Access Control mapped to CWE-284 Improper Access Control; CWE-266 CWE-266.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Active exploitation is not confirmed from current sources for CVE-2026-90851. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-90851 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2026-90851. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-90851 using CVSS 6.3, EPSS 0%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Prioritize based on EPSS, PoC availability, and external exposure. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

mediumAccess Control

CVE-2026-90851

CVE-2026-90851 — PHPGurukul Hostel Management System checklogin.php access control

A flaw has been found in PHPGurukul Hostel Management System 3.0. This affects an unknown part of the file /admin/includes/checklogin.php. This manipulation of the argument ID causes improper access controls. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Published Sep 15, 2026Updated Sep 15, 2026Sources: NVD, PHPGurukul (CNA), GitHub, GitHub Security Advisory, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

ahead of 0% of scored CVEs

Affects

PHPGurukul

Hostel Management System

CVSS base

6.3

medium · 6 sources

Remediation

The vendor's own words where we have them.

Upgrade Hostel Management System to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Prioritize based on EPSS, PoC availability, and external exposure.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
PHPGurukul	Hostel Management System	3.0	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

Low

Confidentiality

Low

Integrity

Low

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Network

Privileges Req

Low

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
6.3	CVSS 3.1	medium	2.8	3.4	NVD, GHSA
6.5	CVSS 2.0	medium	8	6.4	vuldb.com (CNA)
5.3	CVSS 4.0	medium	—	—	PHPGurukul (CNA)
6.3	CVSS 3.1	medium	—	—	PHPGurukul (CNA)
6.3	CVSS 3.0	medium	—	—	PHPGurukul (CNA)
6.5	CVSS 2.0	medium	—	—	PHPGurukul (CNA)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-266 · Incorrect Privilege Assignment

Gain Privileges or Assume Identity

Mitigation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

CWE-284 · Improper Access Control

Varies by Context::

Mitigation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

Weakness & attack patterns

CWE-284Improper Access Control
CWE-266

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-562 · Modify Shared FileCAPEC-19 · Embedding Scripts within ScriptsCAPEC-503 · WebView ExposureCAPEC-441 · Malicious Logic InsertionCAPEC-563 · Add Malicious File to Shared WebrootCAPEC-478 · Modification of Windows Service ConfigurationCAPEC-479 · Malicious Root CertificateCAPEC-502 · Intent SpoofCAPEC-536 · Data Injected During ConfigurationCAPEC-546 · Probe Application MemoryCAPEC-550 · Install New ServiceCAPEC-551 · Modify Existing Service

T1027.009Obfuscated Files or Information: Embedded Payloads
T1546.004Event Triggered Execution: .bash_profile and .bashrc
T1546.016Event Triggered Execution: Installer Packages

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Search application, proxy, and WAF logs for requests touching /admin/includes/checklogin.php.
Prioritize edge telemetry for network-reachable Hostel Management System.

web/proxy/WAF logsapplication logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 6.3 (AV:N)
Sep 15, 2026 · NVD
Initial · CVE published
Sep 15, 2026 · NVD
Added · GHSA-fqcp-p9cx-qvwf published (low)
Sep 15, 2026 · GitHub Security Advisory
CVE published by MITRE.
Sep 15, 2026 · SOCRadar CTI
Reported · Advisory disclosed
Sep 14, 2026 · PHPGurukul
Reported · VulDB entry created
Sep 14, 2026 · PHPGurukul
Reported · VulDB entry last update
Sep 14, 2026 · PHPGurukul

References

8 on the record

github.com/usernamevnq/CVEs/issues/10
Exploit, Third Party Advisory
phpgurukul.com/
Vendor Advisory
vuldb.com/cve/CVE-2026-90851
Vendor Advisory
vuldb.com/submit/926972
Vendor Advisory
vuldb.com/vuln/403406
Vendor Advisory
vuldb.com/vuln/403406/cti
Vendor Advisory
nvd.nist.gov/vuln/detail/CVE-2026-90851
NVD
github.com/advisories/GHSA-fqcp-p9cx-qvwf
Exploit, Third Party Advisory

Coverage

1 story from the feeds we poll

CVE-2026-90851
vuldb.com · Sep 14, 2026

Elsewhere on this site

PHPGurukulevery CVE for this vendor
Access Controlsame class
CWE-284other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-90851 is PHPGurukul Hostel Management System checklogin.php access control, a medium vulnerability affecting Hostel Management System from PHPGurukul. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-90851. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2026-90851. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 6.3 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.