Umbraco CMS logout page displayed before session expiration
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.
- Published
- Oct 22, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 15th percentile
- CWE
- CWE-613
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Report tools
Action score
12
Monitor
Low priority for now.
- CVSS
- 12 / 40 · 3.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 3.1
- CNA · GitHub_M
- 4.2
- 1.1 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| umbraco | umbraco cms | cpe:2.3:a:umbraco:umbraco_cms |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- umbraco umbraco cms8.0 and later · before 8.18.15
- umbraco umbraco cms10.0 and later · before 10.8.7
- umbraco umbraco cms13.0 and later · before 13.5.2
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
umbraco Umbraco-CMS
- >= 13.0.0, < 13.5.2, >= 10.0.0, < 10.8.7, >= 8.0.0, < 8.18.15affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| NuGet | Umbraco.CMS | from 10.0.0 · before 10.8.7 | 10.8.7 |
| NuGet | Umbraco.CMS | from 13.0.0 · before 13.5.2 | 13.5.2 |
| NuGet | UmbracoCMS | from 8.0.0 · before 8.18.15 | 8.18.15 |
Same product
umbraco: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-67288An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code by uploading a crafted PDF file.40Plan
- CVE-2020-5810A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current.40Plan
- CVE-2014-10074Umbraco before 7.2.0 has a remote PHP code execution vulnerability because Umbraco.Web.UI/config/umbracoSettings.Release.config does not blo40Plan
- CVE-2012-1301The FeedProxy.aspx script in Umbraco 4.7.0 allows remote attackers to proxy requests on their behalf via the "url" parameter.40Plan
- CVE-2023-37267Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions39Monitor
- CVE-2012-10054Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE38Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| NuGet:Umbraco.CMS | 10.8.7 | Package registry (OSV) |
| NuGet:Umbraco.CMS | 13.5.2 | Package registry (OSV) |
| NuGet:UmbracoCMS | 8.18.15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-613 · Insufficient Session ExpirationCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.