PT-2025-33828 · Astro · Astro

Chriselbring-Avalabs + 2 · Published 2025-08-19 · Updated 2025-08-19 · CVE-2025-55303

Positive Technologies · (AI Summary)

CVSS v4.0

6.9

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Name of the Vulnerable Software and Affected Versions:

Astro versions prior to 5.13.2

Astro versions prior to 4.16.18

Description:

Astro is a web framework for content-driven websites. The image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. The `/ image` endpoint, which returns optimized versions of images, is affected. An attacker can bypass third-party domain restrictions by using a protocol-relative URL as the image source, such as `/ image?href=//example.com/image.png`.

Recommendations:

Update to Astro version 5.13.2 or later.

Update to Astro version 4.16.18 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-115

CWE-79

Related Identifiers

CVE-2025-55303

GHSA-XF8X-J4P2-F749

Affected Products

Astro

References · 8

• 🔥 https://github.com/withastro/astro/security/advisories/GHSA-xf8x-j4p2-f749 · Exploit
• https://osv.dev/vulnerability/GHSA-xf8x-j4p2-f749 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-55303 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-55303 · Security Note
• https://github.com/withastro/astro · Note
• https://github.com/withastro/astro/commit/4d16de7f95db5d1ec1ce88610d2a95e606e83820 · Note
• https://twitter.com/CVEnew/status/1957877394854855138 · Twitter Post
• https://t.me/CVEtracker/30386 · Telegram Post