What is CVE-2026-61834?

CVE-2026-61834 is a medium-severity vulnerability in Thomaspoignant Scim-Patch, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 4.3/10. Published 2026-09-23.

How severe is CVE-2026-61834?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Prototype Pollution in Thomaspoignant Scim-Patch

CVE-2026-61834

scim-patch is a library for applying SCIM patch operations. Prior to 0.9.2, navigate() reads inherited properties and assign() uses prototype-chain membership checks while resolving attacker-controlled SCIM PATCH paths. A path or one of the dotted value keys beginning with an inherited property such as toString can therefore traverse into a shared built-in function object and add attacker-controlled properties, causing process-global mutation that may affect application logic reading inherited-method properties. This issue is fixed in version 0.9.2.

Vulnerability class: Mass Assignment

Published 2026-09-23 · last modified 2026-09-23.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Thomaspoignant Scim-Patch — versions < 0.9.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-61834?: CVE-2026-61834 is a medium-severity vulnerability in Thomaspoignant Scim-Patch, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 4.3/10. Published 2026-09-23.
How severe is CVE-2026-61834?: Medium severity. CVSS v3 base score is 4.3 out of 10.