VulnerabilityPublished 11 Mar 2026

CVE-2026-3958: Woahai321 ListSync · Server-Side Request Forgery

Affects Woahai321 ListSyncSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system 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 to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
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), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 29 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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
Woahai321ListSync	Affected 0.6.0 – 0.6.6 7 affected builds	Fixed in–
GitHubwoahai321/list-sync`pkg:github/woahai321/list-sync`Other threats	Affected 0.6.0 – 0.6.6 7 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

2) Implement strict input validation and sanitization on any user-supplied URLs or parameters that influence requests.post calls to prevent malicious URL injection. 3) Use network segmentation and firewall rules to limit the server's ability to make outbound requests to sensitive internal resources. 4) Monitor and log outbound requests from the ListSync server to detect unusual or unauthorized request patterns. 5) If possible, deploy a web application firewall (WAF) with rules to detect and block SSRF attack patterns targeting ListSync. 6) Consider temporarily disabling or restricting the vulnerable JSON Handler functionality if feasible. 7) Stay alert for vendor updates or patches and plan for immediate deployment once available. 8) Conduct internal security assessments to identify any potential exploitation attempts and review access controls around the affected systems.

Description

CVE-2026-3958 is a server-side request forgery (SSRF) vulnerability in Woahai321 ListSync versions up to 0.6.6. It arises from improper handling in the requests.post function within the JSON Handler component, allowing remote attackers to manipulate server requests. The vulnerability requires no user interaction and can be exploited remotely without authentication, potentially enabling attackers to make unauthorized requests from the vulnerable server. Although the exploit has been publicly disclosed, there are no known active exploits in the wild yet. The vendor has been informed but has not issued a patch or response. The CVSS 4.0 base score is 5.

Impact

The SSRF vulnerability in ListSync can allow attackers to make unauthorized requests from the vulnerable server to internal or external systems. This can lead to several impacts including unauthorized access to internal network resources, bypassing network access controls, and potential information disclosure if internal services respond with sensitive data. Attackers might also use this vulnerability as a pivot point to conduct further attacks within an organization's network. Although the CVSS score is medium, the ease of remote exploitation without authentication elevates the risk, especially in environments where ListSync is exposed to untrusted networks. The vulnerability could disrupt normal operations if exploited to access or manipulate internal services, potentially impacting confidentiality and integrity of data. Organizations relying on ListSync for synchronization tasks may face operational risks and data exposure until the vulnerability is addressed.

References

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