CVE-2024-37829Public exploitNetwork attack vector

Session hijacking via reusable magic sign-in link

Published Jul 9, 2024 · Updated Aug 2, 2024

Session fixation in Outline 0 through 0.76.1 allows remote attackers to hijack a user's session through a crafted magic sign-in link. Opening the attacker's link overwrites an authenticated user's access token with the token embedded in that link, which remains valid after use. The victim must open the link while authenticated; subsequent activity occurs in a session shared with the attacker, exposing entered information.

CVSS severity8.8
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Outline 0 through 0.76.1 allows remote attackers to hijack a user's session through a crafted magic sign-in link. Opening the attacker's link overwrites an authenticated user's access token with the token embedded in that link, which remains valid after use. The victim must open the link while authenticated; subsequent activity occurs in a session shared with the attacker, exposing entered information.

The record

CVE
CVE-2024-37829
Published
Jul 9, 2024
Updated
Aug 2, 2024
Vendor
Outline
Product
Outline
Classifications
CWE-384, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <=0.76.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Outline · Outlineversion=0 <=0.76.1

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-384Session Fixation
T1566.002Spearphishing Link

Public exploit references

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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