Medium severity · published Apr 15, 2026
CVE-2026-39845
Weblate: SSRF via the webhook add-on using unprotected fetch_url()
4.1
CVSS
0.3%
EPSS
No
On KEV
Description
Weblate is a web based localization tool. In versions prior to 5.17, the webhook add-on did not utilize existing SSRF protections. This issue has been fixed in version 5.17. If developers are unable to update immediately, they can disable the webhook add-on as a workaround.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
weblate · WeblateOrg
< 5.17 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39845
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39845
Issue Tracking
https://github.com/WeblateOrg/weblate/pull/18815
Third Party Advisory
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-f8hv-g549-hwg2
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