CVE-2025-54793Public exploitNetwork attack vector

Open redirect via double-slash path canonicalization

Published Aug 8, 2025 · Updated Aug 8, 2025

Open redirect in Astro 5.2.0 through 5.12.7 allows remote attackers to send users to external domains via crafted double-slash URLs. The SSR trailing-slash canonicalizer fails to classify paths beginning with // as internal exceptions, so it emits attacker-controlled network-path references in Location headers. Only on-demand rendered sites using Node or Cloudflare adapters are exposed; static, Netlify, and Vercel deployments are unaffected, and exploitation requires a user to follow the crafted link.

CVSS severity6.1
Medium
EPSS probability0.61%
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 5.2.0 through 5.12.7 allows remote attackers to send users to external domains via crafted double-slash URLs. The SSR trailing-slash canonicalizer fails to classify paths beginning with // as internal exceptions, so it emits attacker-controlled network-path references in Location headers. Only on-demand rendered sites using Node or Cloudflare adapters are exposed; static, Netlify, and Vercel deployments are unaffected, and exploitation requires a user to follow the crafted link.

The record

CVE
CVE-2025-54793
Published
Aug 8, 2025
Updated
Aug 8, 2025
Vendor
Astro Technology Company
Product
Astro
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=>= 5.2.0, < 5.12.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Astro Technology Company · Astroversion=>= 5.2.0, < 5.12.8

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.5GitHub, Inc.CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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