CVE-2024-48929Network attack vector

Session reuse via incomplete sign-out termination

Published Oct 22, 2024 · Updated Oct 22, 2024

Umbraco CMS 10.0.0 through 10.8.6 and 13.0.0 through 13.5.1 has a session termination flaw that allows attackers to reuse signed-out sessions. The explicit sign-out flow leaves its server-side session active instead of invalidating it; Umbraco has not disclosed the responsible code path or operation. Exploitation requires user interaction and high-complexity conditions, with unauthorized session reuse affecting data access or modification but not service availability.

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

Umbraco CMS 10.0.0 through 10.8.6 and 13.0.0 through 13.5.1 has a session termination flaw that allows attackers to reuse signed-out sessions. The explicit sign-out flow leaves its server-side session active instead of invalidating it; Umbraco has not disclosed the responsible code path or operation. Exploitation requires user interaction and high-complexity conditions, with unauthorized session reuse affecting data access or modification but not service availability.

The record

CVE
CVE-2024-48929
Published
Oct 22, 2024
Updated
Oct 22, 2024
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-384, T1550.004
Attack vector
network
Privileges
Unavailable

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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

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

Published CVSS scores

4.2NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
4.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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