VulnerabilityPublished 9 Jul 2024Updated 2 Aug 2024

CVE-2024-37830: Outline · Open Redirect

Affects OutlineSource CVE Database V5

Not known to be exploited · CVSS 4.3 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jul 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GitHubsysentr0py/Outline`pkg:github/sysentr0py/Outline`Other threats	Affected <=0.76.1	Fixed in–

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AI-suggested

To mitigate CVE-2024-37830, organizations should first monitor for official patches or updates from the Outline development team and apply them promptly once available. In the interim, network-level protections such as enforcing HTTPS with HSTS can reduce the risk of cookie interception by encrypting traffic and preventing man-in-the-middle attacks. Implementing secure cookie flags (HttpOnly, Secure, SameSite) can also help protect cookies from being accessed or manipulated by attackers. Administrators should review and harden the application’s redirect logic to ensure that any redirect URLs are strictly validated against a whitelist of trusted domains, preventing arbitrary redirection. User education on recognizing suspicious redirects and phishing attempts can reduce the likelihood of successful exploitation. Additionally, deploying web application firewalls (WAFs) with rules to detect and block open redirect patterns may provide temporary protection. Regular security assessments and penetration testing focused on session management and redirect handling are recommended to identify and remediate similar issues proactively.

Description

An issue in Outline <= v0.76.1 allows attackers to redirect a victim user to a malicious site via intercepting and changing the state cookie.

Impact

The primary impact of CVE-2024-37830 is the potential for attackers to redirect users to malicious websites, which can lead to phishing, credential theft, or malware infections. While the vulnerability does not directly compromise confidentiality or availability, it undermines the integrity of user sessions and trust in the application. Organizations relying on Outline for internal documentation or collaboration may face increased risk of social engineering attacks targeting their employees or users. This could result in compromised credentials, unauthorized access to sensitive information, or broader network compromise if attackers use the redirect to deliver payloads. The ease of exploitation, requiring only interception and modification of a cookie, means attackers on the same network or with access to network traffic can leverage this vulnerability. The lack of authentication requirements lowers the barrier for exploitation, but user interaction is necessary to trigger the redirect. Overall, the vulnerability poses a moderate risk that can facilitate more severe attacks if combined with other threats.

CWE-601URL Redirection to Untrusted Site ('Open Redirect') (opens in a new tab)
Base weaknessLikelihood of exploit: LowOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.5 (opens in a new tab)
Attack patterns
Cross-Site Flashing (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/sysentr0py/CVEs/tree/main/CVE-2024-37830 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Feb 2026, 03:48 UTC

WeaknessesCWE-601

Technical details

References

Community reviews

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