# CVE-2026-86544 — knowns-dev knowns

> As of 2026-09-07, CVE-2026-86544 is a HIGH-severity vulnerability in knowns-dev knowns, CVSS v3.1 8.1, EPSS 0.3% (23.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-86544 as of 2026-09-07; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-07

## What is CVE-2026-86544?

knowns versions before 0.30.0 contain an authorization bypass vulnerability where mutating code actions are incorrectly classified as read-only operations. Attackers with read-restricted sessions can exploit code.replace to modify permission configurations and escalate privileges on subsequent calls.

The record classifies CVE-2026-86544 under weakness class [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 28 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.1 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`)
- **CVSS v4.0 base score:** 7.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-07

## Is CVE-2026-86544 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [knowns-dev](https://intel.threadlinqs.com/vendors/knowns-dev): knowns

## How to fix CVE-2026-86544

No vendor patch reference has been recorded for CVE-2026-86544 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-86544

No threat campaign in the Threadlinqs corpus currently references CVE-2026-86544, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on 2026-09-08. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [github.com](https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/permissions/guard.go#L44-L60)
- [github.com (registry)](https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/permissions/registry.go#L99-L140)
- [github.com (a2c98fc5c313463576c9348beeec6a74ddd7333b)](https://github.com/knowns-dev/knowns/commit/a2c98fc5c313463576c9348beeec6a74ddd7333b)
- [github.com (v0.30)](https://github.com/knowns-dev/knowns/releases/tag/v0.30.0)
- [github.com (GHSA w323 3wpx f7g5)](https://github.com/knowns-dev/knowns/security/advisories/GHSA-w323-3wpx-f7g5)

_Showing 5 of 6 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-86544
Full detection coverage and IOCs for threats exploiting CVE-2026-86544 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp