Is CVE-2026-39845 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-39845 being exploited in the wild.

How severe is CVE-2026-39845?

Medium severity, with a CVSS score of 4.1, published 15 April 2026.

Which products and versions are affected?

weblate (PyPI) < 5.17, ECOSYSTEM:introduced=0,fixed=5.17.

Is there a fix for CVE-2026-39845?

Yes. weblate (PyPI): upgrade to 5.17 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-39845 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-39845?

Check whether you run weblate (PyPI) or Weblate at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-39845: Weblate SSRF in webhook add-on via fetch_url

Q: Which products and versions are affected?

weblate (PyPI) < 5.17, ECOSYSTEM:introduced=0,fixed=5.17.

Q: Is there a fix for CVE-2026-39845?

Yes. weblate (PyPI): upgrade to 5.17 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-39845 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-39845?

Check whether you run weblate (PyPI) or Weblate at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-39845 · Severity: medium · CVSS 4.1 · Published 2026-04-15

Weblate is a web-based translation and localization tool. A security flaw in its webhook add-on allows high-privileged users to bypass internal network protections. This could allow an attacker to probe or access internal services that are not intended to be reachable from the internet.

Technologies: weblate (PyPI), Weblate. Vendors: PyPI, Weblate.

Quick answers

Is CVE-2026-39845 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-39845 being exploited in the wild.
How severe is CVE-2026-39845?: Medium severity, with a CVSS score of 4.1, published 15 April 2026.
Which products and versions are affected?: weblate (PyPI) < 5.17, ECOSYSTEM:introduced=0,fixed=5.17.
Is there a fix for CVE-2026-39845?: Yes. weblate (PyPI): upgrade to 5.17 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-39845 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-39845?: Check whether you run weblate (PyPI) or Weblate at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

weblate (PyPI): upgrade to 5.17 or later
```
pip install "weblate>=5.17"
```

Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in Weblate's webhook add-on due to the use of an unprotected fetch_url() function. The component fails to apply existing SSRF protections when processing webhook requests. An attacker with high privileges (PR:H) can exploit this over the network to make the server send requests to arbitrary internal or external URLs. This can lead to unauthorized information disclosure from internal services. The issue is fixed in version 5.17.

Affected products

WeblateOrg weblate < 5.17

Identifiers

CVE-2026-39845
GHSA-f8hv-g549-hwg2
PYSEC-2026-156

Timeline

2026-04-15: disclosed
2026-04-16: advisory
2026-04-15: patched: Version 5.17 released

References

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