# CVE-2026-40082 — cacti

> As of 2026-06-26, CVE-2026-40082 is a MEDIUM-severity vulnerability in cacti, CVSS v3.1 5.4. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-40082 as of 2026-06-26; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-26

## What is CVE-2026-40082?

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have missing session_regenerate_id() after login, leading to Session Fixation. session_regenerate_id() is NOT called after successful login. The login flow at auth_login.php:203-207 directly sets $_SESSION[SESS_USER_ID] without rotating the session ID. The session cookie configuration is otherwise good (httponly=true, samesite=Strict, secure=true for HTTPS at include/global.php:513-537), but these do not prevent session fixation via same-site vectors. This issue has been fixed in version 1.2.31.

The record classifies CVE-2026-40082 under weakness class [CWE-384](https://intel.threadlinqs.com/cwe/CWE-384). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 102 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-25, last modified 2026-06-26

## Is CVE-2026-40082 being exploited?

It currently carries a trending score of 29 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Cacti](https://intel.threadlinqs.com/vendors/cacti): cacti

## How to fix CVE-2026-40082

No vendor patch reference has been recorded for CVE-2026-40082 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-2026-40082

No threat campaign in the Threadlinqs corpus currently references CVE-2026-40082, 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. Last verified by Threadlinqs on 2026-06-28. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp)

**Other references**

- [github.com](https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198)
- [github.com (release%2F1.2)](https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-40082
Full detection coverage and IOCs for threats exploiting CVE-2026-40082 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp