CVE-2025-55207Public exploitNetwork attack vector

Open redirect via protocol-relative trailing-slash path

Published Aug 15, 2025 · Updated Aug 15, 2025

Open redirect in Astro before 9.4.1 allows remote attackers to send users to an external site through a crafted link. The Node adapter’s standalone static handler appends a slash and writes the resulting protocol-relative path to the Location header without rejecting internal-path syntax. Exploitation requires trailingSlash set to always and a user to follow the crafted link, enabling phishing through a trusted origin.

CVSS severityUnavailable
Unscored
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Astro before 9.4.1 allows remote attackers to send users to an external site through a crafted link. The Node adapter’s standalone static handler appends a slash and writes the resulting protocol-relative path to the Location header without rejecting internal-path syntax. Exploitation requires trailingSlash set to always and a user to follow the crafted link, enabling phishing through a trusted origin.

The record

CVE
CVE-2025-55207
Published
Aug 15, 2025
Updated
Aug 15, 2025
Vendor
Astro Technology Company
Product
Astro
Classifications
CWE-601, T1566.002, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 9.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Astro Technology Company · Astroversion=< 9.4.1

Published CVSS scores

5.5GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link
T1204.001Malicious 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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