CVE-2026-5261: Improper Access Control Vulnerability (CVSS 7.3)

Description

A vulnerability was identified in Shandong Hoteam InforCenter PLM up to 8.3.8. The impacted element is the function uploadFileToIIS of the file /Base/BaseHandler.ashx. The manipulation of the argument File leads to unrestricted upload. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Metrics

CVSS 3.1

7.3/10

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

CVSS 4.0

5.5/10

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 Probability

0.39%

30.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

References

Timeline

Published: Apr 1, 2026
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-5261?

A vulnerability was identified in Shandong Hoteam InforCenter PLM up to 8.3.8. The impacted element is the function uploadFileToIIS of the file /Base/BaseHandler.ashx. The manipulation of the argument File leads to unrestricted upload. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

How severe is CVE-2026-5261?

CVE-2026-5261 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5261?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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