CVE•Published 2026-05-08•Modified 2026-07-24•1 article on news•6 live references•NVD data
CVE-2026-42556Gitroom · Postiz
Vulnerability data via NVD (ingested)
CVSS v3.1
8.9
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
EPSS percentile
17
Exploit Prediction Scoring System · top 83% of all CVEs
Weaknesses (CWE)
Description
Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7.
Timeline
Published 2026-05-08
Modified 2026-07-24
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-42556Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Gitroom Postiz" version:"2.21.6"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Postiz"HTTP body or banner mentions "Postiz" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-42556Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-42556Censys host search filtered to this CVE id.
grep.app
CVE-2026-42556Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-42556GitHub code search for direct mentions.
Google dork
"CVE-2026-42556" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.