CVE-2026-48781

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, the Skool integration callback signed an attacker-controlled JSON blob into a session-shape JWT using the application's JWT_SECRET, and the auth middleware trusted every claim in that JWT without re-resolving the user from the database. Any authenticated Postiz user could forge a SUPERADMIN session and impersonate arbitrary organizations. This allowed Full Access to the following: all parts of Postiz, including users registered to the specific instance and the ability to post in the name of the victim's social media channels added to that Postiz instance. This issue has been fixed in version 2.21.8.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
11.1%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 18, 2026

Advisory Details (4)

Auto-updated Jul 11, 2026
Patch available. Sources: github_release, github_commit, github.
github Patch Available

SUPERADMIN takeover via Skool-provider JWT forgery · Advisory · gitroomhq/postiz-app · GitHub

https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2
github_commit Patch Available

commit 23696d297351 (gitroomhq/postiz-app)

Patch available: gitroomhq/postiz-app v2.21.8 (contains commit 23696d297351)

https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05
generic

PSA-2026-2CAQ96: SUPERADMIN takeover via Skool-provider JWT forgery — GAdvisory

https://gadvisory.org/advisories/PSA-2026-2CAQ96
github_release Patch Available

v2.21.8

Patch available: gitroomhq/postiz-app v2.21.8

http://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 47× in last 7d / 176× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 176 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-48781?
CVE-2026-48781 is a critical vulnerability published on June 17, 2026. Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, the Skool integration callback signed an attacker-controlled JSON blob into a session-shape JWT using the application's JWT_SECRET, and the auth middleware trusted every claim in that JWT without re-resolving the user from…
When was CVE-2026-48781 disclosed?
CVE-2026-48781 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48781 actively exploited?
CVE-2026-48781 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48781?
CVE-2026-48781 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-48781?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48781, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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