Postiz is an AI social media scheduling tool. Prior to 2.21.8, Postiz fails to verify Nowpayments IPN callback authenticity against the payment provider shared secret and reads the target subscription identifier from the untrusted request body, allowing a low-privileged account to grant arbitrary organizations lifetime PRO subscriptions without payment. This issue is fixed in version 2.21.8.
CVE-2026-48799
HIGHPre-NVD 7.77.7
EchelonGraph scoreLOW confidence
This high-severity CVE scores 7.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
7.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.7Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.7
- EG Score
- 7.7(low)
- EPSS
- —
- KEV
- Not listed
Published
July 15, 2026
Last Modified
July 15, 2026
Advisory Details (4)
Auto-updated Jul 15, 2026Patch available. Sources: github, github_commit, github_release.
github_release Patch Available
v2.21.8
Patch available: gitroomhq/postiz-app v2.21.8
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8generic
PSA-2026-Q3TCPK: Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook — GAdvisory
https://gadvisory.org/advisories/PSA-2026-Q3TCPKgithub_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/23696d2973510ae1f3f48bfa41a6bfbbf9827b05github Patch Available
Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook · Advisory · gitroomhq/postiz-app · GitHub
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j7rp-5mgj-qgg9Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× 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.
- 2026-07-15 16:29 UTCEG score recompute
- 2026-07-15 16:29 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-639 · CWE-345
- CVE-2018-25270EG 9.8CRITICAL
- CVE-2017-20223EG 9.8CRITICAL
- CVE-2019-15310EG 9.8EPSS 94%CRITICAL
- CVE-2016-1000004EG 9.8CRITICAL
- CVE-2019-15913EG 9.8CRITICAL
- CVE-2013-2167EG 9.8CRITICAL
- CVE-2019-16340EG 9.8EPSS 97%CRITICAL
- CVE-2019-13360EG 9.8EPSS 98%CRITICAL
- CVE-2019-12866EG 9.8CRITICAL
- CVE-2019-11235EG 9.8CRITICAL
Frequently asked(4)
What is CVE-2026-48799?
CVE-2026-48799 is a high vulnerability published on July 15, 2026. Postiz is an AI social media scheduling tool. Prior to 2.21.8, Postiz fails to verify Nowpayments IPN callback authenticity against the payment provider shared secret and reads the target subscription identifier from the untrusted request body, allowing a low-privileged account to grant arbitrary…
When was CVE-2026-48799 disclosed?
CVE-2026-48799 was first published in the National Vulnerability Database on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-48799?
CVE-2026-48799 has a CVSS v3 base score of 7.7 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-48799?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48799, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-48799
Is Your Infrastructure Affected by CVE-2026-48799?
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