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.
CVE-2026-40082
MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.4
- EG Score
- 5.4(medium)
- EPSS
- 8.1%
- KEV
- Not listed
Published
June 25, 2026
Last Modified
June 29, 2026
Advisory Details (2)
Auto-updated Jun 25, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available
Session Fixation via missing session_regenerate_id() after login · Advisory · Cacti/cacti · GitHub
https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcpgithub_commit Patch Available
commit 2fa404e70a57 (Cacti/cacti)
Patch available: Cacti/cacti release/1.2.31 (contains commit 2fa404e70a57)
https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2026-40082?
CVE-2026-40082 is a medium vulnerability published on June 25, 2026. Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have missing sessionregenerateid() after login, leading to Session Fixation. sessionregenerateid() is NOT called after successful login. The login flow at authlogin.php:203-207 directly sets…
When was CVE-2026-40082 disclosed?
CVE-2026-40082 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40082 actively exploited?
CVE-2026-40082 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40082?
CVE-2026-40082 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-40082?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40082, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-40082
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