VulnerabilityPublished 30 Jun 2026Updated 8 Nov 2026

CVE-2026-58371: seaweedfs · Cross-site Scripting

Affects seaweedfsSource CVE Database V5

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Public exploit available · CVSS 3.1 Low : upgrade to 4.30 as a priority.

Data as of 8 Nov 2026, 14:36 UTC

CVSS 3.1 base score

3.1Low

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (VulnCheck)	CVSS 3.1	3.1
CNA (VulnCheck)	CVSS 4.0	2.3

Exploitation: Proof of concept is public or traded
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-07-01.

Patch

Available – fixed in 4.30

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: None
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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
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: 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 impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 30 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CISA SSVC: 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

CVE ID reserved
by VulnCheck
30 Jun 202612:28 UTC, 3 hours before disclosure
CVE published
on cve.org
30 Jun 202615:57 UTC, t = 0
CISA SSVC assessment
proof of concept public
1 Jul 202615:05 UTC, 23 hours after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 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

Upgrade seaweedfs to 4.30.

Affected software

Product	Affected	Fixed in
seaweedfsseaweedfs	Affected <4.30	Fixed in 4.30
GitHubseaweedfs`pkg:github/seaweedfs`Other threats	Affected <4.30	Fixed in 4.30

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

AI-suggested

Upgrade SeaweedFS to version 4.30 or later, where this vulnerability is fixed. The fix includes proper validation of the callback parameter, setting the X-Content-Type-Options: nosniff header, and implementing CORS allow-listing to prevent cross-origin script loading. Until upgraded, restrict access to the affected endpoints by configuring appropriate whitelists and security settings, and avoid exposing these endpoints to untrusted networks.

Description

CVE-2026-58371 is a cross-site scripting (XSS) vulnerability in SeaweedFS versions before 4.30. It arises from improper neutralization of the callback query parameter in JSON endpoints, which are served with Content-Type application/javascript without validation or security headers. This allows a third-party web page to load these endpoints cross-origin via a script tag and read sensitive cluster information such as topology, volume server URLs, gRPC ports, file identifiers, and directory listings. The vulnerability affects multiple unauthenticated endpoints accessible by default configurations. The issue is fixed in SeaweedFS version 4.30.

Impact

An attacker can exploit this vulnerability to perform cross-origin data theft by injecting a malicious callback parameter in requests to various JSON endpoints. This allows reading sensitive information about the SeaweedFS cluster, including topology, volume server URLs, gRPC ports, file identifiers, and directory listings. The vulnerability does not allow code execution or data modification but can expose internal cluster details to unauthorized third parties. The CVSS score is low (3.1) reflecting limited impact with network attack vector, high attack complexity, no privileges required, and user interaction needed.

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Affected software

Description

AI analysisMachine-generated, updated 8 Nov 2026, 14:36 UTC

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