High
Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream
Type: advisorySources: OSV
Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40168
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 19:04 UTC · Revision 1
Source evidence
Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream
core-osv · Original sourcePublished 10 Apr 2026, 19:20 UTC
Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.
osv:CVE-2026-40168
Complete source record
{
"id": "a179bc190ab92e6f31c9850f431c07d4ac05fd0383f5d48239fcd6e63a321272",
"url": "https://osv.dev/vulnerability/CVE-2026-40168",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream",
"summary": "Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.",
"evidence": "osv:CVE-2026-40168",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-40168",
"aliases": [
"CVE-2026-40168",
"GHSA-34w8-5j2v-h6ww"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gitroomhq/postiz-app",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "3e8a0ab817ea50475f319797b1256ae9eba0e704"
},
{
"fixed": "30e8b777098157362769226d1b46d83ad616cb06"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.21.5"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "30e8b777098157362769226d1b46d83ad616cb06"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "3e8a0ab817ea50475f319797b1256ae9eba0e704"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v2.21.5"
}
]
}
}
],
"versions": [
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"v2.21.2",
"v2.21.1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40168.json"
}
}
],
"modified": "2026-10-28T02:30:47.940287931Z",
"provider": "osv",
"references": [
"https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.5",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40168.json",
"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40168",
"https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40168.json"
}
},
"related_cves": [
{
"value": "CVE-2026-40168",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 515939,
"published_at": "2026-04-10T19:20:16.365+00:00"
}