Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Microweber CMS 2.0.20 Stored XSS via tag_names Parameter
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N H P N N N 4.8 .0016 5.8 —
AFFECTED
Product Versions Fixed
microweber unspecified —
TIMELINE
Jul 29 Reserved by VulnCheck
Aug 3 Published (CNA: VulnCheck)
Aug 4 EXPLOIT PUBLISHED — CVE-2026-67617 (microweber). Public exploit reference added.
Aug 13 EXPLOIT PUBLISHED — CVE-2026-67617 (microweber). Public exploit reference added.
Description
Microweber CMS through 2.0.20 contains a stored cross-site scripting vulnerability in the content tagging system that allows admin-authenticated attackers to inject arbitrary JavaScript by submitting malicious payloads via the tag_names parameter of the GET /api/save_content_admin endpoint, bypassing three independent sanitization controls including XSS middleware that ignores GET requests, a strip_unsafe() function that only matches double-quoted onerror attributes, and a titlecase normalizer that passes HTML decimal entity-encoded payloads through unchanged. Attackers can store malicious scripts that execute without user interaction for every visitor to the public blog page and within the admin post editor, enabling session riding through same-origin fetch requests using the CSRF token embedded in the page.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| July 29, 2026 | Reserved | Reserved by VulnCheck |
| August 3, 2026 | Published | Published (CNA: VulnCheck) |
| August 4, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-67617 (microweber). Public exploit reference added. |
| August 13, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-67617 (microweber). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| microweber | microweber | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67617 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.