Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34577
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:25 UTC · Revision 1
Source evidence
Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check
core-osv · Original sourcePublished 2 Apr 2026, 17:24 UTC
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.
osv:CVE-2026-34577
Complete source record
{
"id": "d1321b3b27a9ce6690b2a6068cb03d1933766cdbfe2c113e67e774a891a64438",
"url": "https://osv.dev/vulnerability/CVE-2026-34577",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check",
"summary": "Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.",
"evidence": "osv:CVE-2026-34577",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-34577",
"aliases": [
"CVE-2026-34577",
"GHSA-mv6h-v3jg-g539"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gitroomhq/postiz-app",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6f7a80f689bc46f2d0b023e4eac9e3d3ea7c2d01"
}
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"database_specific": {
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
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],
"source": "REFERENCES_TAG",
"original_tag": "v2.21.3"
},
{
"cpe": "cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*",
"range": [
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{
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"source": "CPE_RANGE"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34577.json"
}
}
],
"modified": "2026-10-28T02:30:26.801871142Z",
"provider": "osv",
"references": [
"https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34577.json",
"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-mv6h-v3jg-g539",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34577"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34577.json"
}
},
"related_cves": [
{
"value": "CVE-2026-34577",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493363,
"published_at": "2026-04-02T17:24:33.725+00:00"
}