Medium severity · published Jun 25, 2026
CVE-2026-40082
Cacti: Session Fixation via missing session_regenerate_id() after login
5.4
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
cacti · Cacti
< 1.2.31 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40082
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40082
Patch
https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198
Product
https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31
Exploit
https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp
More from cacti
9.8
CVE-2022-46169
Unauthenticated Command Injection
9.8
CVE-2026-40079
Cacti: Command Injection via escape_command() no-op in RRDtool execution
9.8
CVE-2026-39948
Cacti has SQL Injection via rfilter parameter in RLIKE clauses
9.8
CVE-2026-39955
Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php
9.8
CVE-2026-39938
Cacti: Unauthenticated RCE on Graph Image