CVE-2025-55303

MEDIUM EPSS 44.2%
Published Aug 19, 202510mo ago · Modified Jun 17, 20262w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Aug 19, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

Description

Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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:X/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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
44.2% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-115
CWE-79 Cross-site Scripting Injection

Affected Products 2

VendorProductVersionRange
astroastro* <4.16.18
astroastro*≥5.0.0  –  <5.13.2

References 2

  • github.com https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820
    Patch
  • github.com https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820
    Patch