Umbraco CMS logout page displayed before session expiration

published 2024-10-22 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-3039 , GHSA-fp6q-gccw-7qqm

cvss: 4.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

Umbraco, a free and open source .NET content management system, has an insufficient session expiration issue in versions on the 13.x branch prior to 13.5.2, 10.x prior to 10.8.7, and 8.x prior to 8.18.15. The Backoffice displays the logout page with a session timeout message before the server session has fully expired, causing users to believe they have been logged out approximately 30 seconds before they actually are. Versions 13.5.2, 10.8,7, and 8.18.15 contain a patch for the issue.

Patch / fix

fixed in 3

nuget Umbraco.CMS 10.8.7, 13.5.2
nuget UmbracoCMS 8.18.15
umbraco umbraco_cms 8.18.15, 10.8.7, 13.5.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-10-22)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.2	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
GitHub	3.1	4.2	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
NVD	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
nuget	Umbraco.CMS	>=13.0.0, <13.5.2 >=10.0.0, <10.8.7	13.5.2 10.8.7
nuget	UmbracoCMS	>=8.0.0, <8.18.15	8.18.15

Affected products

umbraco Umbraco-CMS

Classification

Weakness

CWE-613 DEPRECATED: Insufficient Session Expiration

References

github.com /umbraco/Umbraco-CMS/security/advisories/GHSA-fp6q-gccw-7qqm
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-48926
advisory
github.com /umbraco/Umbraco-CMS
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary