Secuno
ENNL
Book demo

CVE-2026-50146

Astro vulnerability

7.1 HIGHPublic exploitEPSS 0.27%
  1. Published22 Jun 2026

Description

Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflected XSS during SSR. This vulnerability is fixed in 6.3.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

Affected products

Astro< 6.3.3

Remediation

Fixed in
Astro≥ 6.3.3

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-528548.6
Maps is a MediaWiki extension that enables visualization of geographic data through…
CVE-2024-583558.9
Cal.com (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting…
CVE-2024-583538.9
Cal.com (repository calcom/cal.diy) in versions <= 4.7.15 is vulnerable to cross-site…
CVE-2026-439388.1
YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5 and 3.2.12, the…
CVE-2026-60028.8
Improper neutralization of Script-Related HTML tags in a web page (basic XSS)…
CVE-2026-328919.0
Anchorr is a Discord bot for requesting movies and TV shows and receiving notifications…

Frequently asked

Is CVE-2026-50146 being actively exploited?

CVE-2026-50146 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.27%.

How severe is CVE-2026-50146?

CVE-2026-50146 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.27% probability of exploitation.

Which products are affected by CVE-2026-50146?

Affected products include Astro.

How do I fix CVE-2026-50146?

Upgrade affected software to a fixed version, for example Astro 6.3.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-50146 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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