CVE-2026-39845 json
Weblate: SSRF via the webhook add-on using unprotected fetch_url()
published 6mo ago modified 14d ago also EUVD-2026-23018 , GHSA-f8hv-g549-hwg2 , PYSEC-2026-156
- cvss
- 4.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Is CVE-2026-39845 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N |
| GitHub | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N |
| OSV | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | weblate | <5.17 |
5.17 |
Affected products
- WeblateOrg weblate
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/WeblateOrg/weblate/pull/18815
web, issue-tracking, patch
-
github.com
/WeblateOrg/weblate/security/advisories/GHSA-f8hv-g549-hwg2
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-39845
advisory
-
github.com
/WeblateOrg/weblate
package
-
github.com
/pypa/advisory-database/tree/main/vulns/weblate/PYSEC-2026-156.yaml
web
Sources
- CVE List CVE-2026-39845
- GitHub Advisory GHSA-f8hv-g549-hwg2
- NVD CVE-2026-39845
- OSV PYSEC-2026-156
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.