CVE-2024-48926Network attack vector

Session reuse via premature logout display

Published Oct 22, 2024 · Updated Oct 22, 2024

Insufficient session expiration in Umbraco CMS allows attackers to reuse a Backoffice session for about 30 seconds after logout. The Backoffice renders its timeout logout page before the server invalidates the session, leaving the existing session credential authorized. Exploitation requires user interaction and access to that credential; resulting access is limited to the brief expiration gap.

CVSS severity4.2
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in Umbraco CMS allows attackers to reuse a Backoffice session for about 30 seconds after logout. The Backoffice renders its timeout logout page before the server invalidates the session, leaving the existing session credential authorized. Exploitation requires user interaction and access to that credential; resulting access is limited to the brief expiration gap.

The record

CVE
CVE-2024-48926
Published
Oct 22, 2024
Updated
Oct 22, 2024
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-613
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 10.0.0, < 10.8.7
  2. Affected versionversion=>= 13.0.0, < 13.5.2
  3. Affected versionversion=>= 8.0.0, < 8.18.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 10.0.0, < 10.8.7; version=>= 13.0.0, < 13.5.2; version=>= 8.0.0, < 8.18.15

Published CVSS scores

4.2GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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