CVE-2026-30118Public exploitNetwork attack vector

Unauthenticated header disclosure via unvalidated proxy URL

Published May 19, 2026 · Updated May 19, 2026

SSRF in Scalar Astro 0.1.13 allows remote attackers to make the Scalar Proxy fetch attacker-controlled URLs without authentication. The scalar_url query parameter is passed directly to the server-side HTTP fetcher without destination validation, and the fetcher forwards inbound cookies and other request headers verbatim. Authentication-cookie disclosure requires a victim request carrying domain-scoped cookies to a self-hosted proxy; the hosted service exposes non-authentication cookies and client-identifying headers.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Scalar Astro 0.1.13 allows remote attackers to make the Scalar Proxy fetch attacker-controlled URLs without authentication. The scalar_url query parameter is passed directly to the server-side HTTP fetcher without destination validation, and the fetcher forwards inbound cookies and other request headers verbatim. Authentication-cookie disclosure requires a victim request carrying domain-scoped cookies to a self-hosted proxy; the hosted service exposes non-authentication cookies and client-identifying headers.

The record

CVE
CVE-2026-30118
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, CAPEC-664, T1190, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1190Exploit Public-Facing Application
T1539Steal Web Session Cookie

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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