HOMEVULNERABILITIESCVE-2026-34590
MEDIUM

CVE-2026-34590

CWE-918Published: April 2, 2026· Updated: Apr 7, 2026

5.4
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:6.8th

Official Description

Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creating webhooks uses WebhooksDto which validates the url field with only @IsUrl() (format check), missing the @IsSafeWebhookUrl validator that blocks internal/private network addresses. The update (PUT /webhooks/) and test (POST /webhooks/send) endpoints correctly apply @IsSafeWebhookUrl. When a post is published, the orchestrator fetches the stored webhook URL without runtime validation, enabling blind SSRF against internal services. This issue has been patched in version 2.21.4.

NVD Source

Technical Analysis

CVE-2026-34590 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

gitroom1 product
postiz
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
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Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11
ADVISORYhttps://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225

All References (3)

→
https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11Patch
→
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4Product · Release Notes
→
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225Exploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-34590
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-918
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedApr 2, 2026

Related CVEs (CWE-918)

CVE-2026-47938
10.0
CVE-2026-32169
10.0
CVE-2026-2053
10.0
CVE-2026-32186
10.0
CVE-2026-32871
10.0
CVE-2026-26138
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34590 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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