CVE-2026-40082 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-40082MEDIUM

Cacti: Session Fixation via missing session_regenerate_id() after login

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  L  L  N    5.4   .0023   14.0     —

AFFECTED
  Product  Versions    Fixed
  cacti    < 1.2.31 –  —

TIMELINE
  Apr 9   Reserved by GitHub_M
  Jun 25  EXPLOIT PUBLISHED — CVE-2026-40082 (cacti). Public exploit reference added.
  Jun 25  Published (CNA: GitHub_M)

CWE-384 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 9, 2026	Reserved	Reserved by GitHub_M
June 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-40082 (cacti). Public exploit reference added.
June 25, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cacti	cacti	—	< 1.2.31	—

Weaknesses

CWE-384

References (3)

https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198 [Patch]
https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31 [Product, Release Notes]
https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-40082 at cve.org

Vendors: cacti

Weaknesses: CWE-384

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-40082 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.