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CVE-2025-59837

Astro server-side request forgery (SSRF)

7.2 HIGHPublic exploitEPSS 0.35%
  1. Published28 Oct 2025

Description

Astro is a web framework that includes an image proxy. In versions 5.13.4 and later before 5.13.10, the image proxy domain validation can be bypassed by using backslashes in the href parameter, allowing server-side requests to arbitrary URLs. This can lead to server-side request forgery (SSRF) and potentially cross-site scripting (XSS). This vulnerability exists due to an incomplete fix for CVE-2025-58179. Fixed in 5.13.10.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

Astro≥ 5.13.4 < 5.13.10

Remediation

Fixed in
Astro≥ 5.13.10

References

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Frequently asked

Is CVE-2025-59837 being actively exploited?

CVE-2025-59837 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.35%.

How severe is CVE-2025-59837?

CVE-2025-59837 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2025-59837?

Affected products include Astro.

How do I fix CVE-2025-59837?

Upgrade affected software to a fixed version, for example Astro 5.13.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.