CVE-2026-39845Network attack vector

Authenticated SSRF via unvalidated webhook delivery

Published Apr 15, 2026 · Updated Apr 15, 2026

SSRF in Weblate before 5.17 allows remote authenticated users to make the server send webhook requests to private-network URLs. The webhook add-on passes its configured webhook_url to fetch_url(), which sends the POST without the existing private-target validation. High-privilege access to configure the add-on is required; the reported consequence is limited to indirect disclosure about server-reachable resources.

CVSS severity4.1
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Weblate before 5.17 allows remote authenticated users to make the server send webhook requests to private-network URLs. The webhook add-on passes its configured webhook_url to fetch_url(), which sends the POST without the existing private-target validation. High-privilege access to configure the add-on is required; the reported consequence is limited to indirect disclosure about server-reachable resources.

The record

CVE
CVE-2026-39845
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
Weblate
Product
Weblate
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Weblate · Weblateversion=< 5.17

Published CVSS scores

4.1GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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