by Kastro
Paper/Archive/CVE-2026-64682

CVE-2026-64682

NauelG astro-blocks — AstroBlocks: Admin session tokens can be forged due to a hard-coded fallback JWT secret and a mismatched environment variable name

CVSS 9.8
critical.is priorityof 100
29
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

AstroBlocks is a block-first CMS for Astro projects. Prior to version 3.4.0, admin session tokens can be forged due to a hard-coded fallback JWT secret and a mismatched environment variable name. An attacker who knows the public fallback value (readable in the published package) can forge a valid session token with role: "owner" and obtain full administrative control of the CMS — creating/deleting content, users, media, redirects, and configuration. This issue has been patched in version 3.4.0.

Affected

ProductAffectedFixed inSource
astro-blocks< 3.4.0–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgithub.com/NauelG/astro-blocks/security/advisories/GHSA-mfcg-m7j5-7v72refgithub.com/NauelG/astro-blocks/pull/51refgithub.com/NauelG/astro-blocks/commit/fd83bf0b37a756363f718e134c16e448da09a74drefgithub.com/NauelG/astro-blocks/releases/tag/v3.4.0