🛡️ CVE-2026-39845 — weblate

🟡 CVSS 4.1 — Medium ✅ No Known Exploit CWE-918 OSV
4.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Weblate: SSRF via the webhook add-on using unprotected fetch_url()

Impact

The webhook add-on did not utilize existing SSRF protection.

Patches

  • https://github.com/WeblateOrg/weblate/pull/18815

Workarounds

Disabling the add-on would avoid misusing this.

References

Thanks to @Lihfdgjr for reporting this via GitHub.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-39845 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.

Affected software

CVE-2026-39845 is recorded against 1 package.

  • weblate (fixed in 5.17)

Timeline and source

Published on 16 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity MEDIUM
CVSS Score 4.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
CWE CWE-918
Public Exploit ✅ No
Source OSV
Published 2026-04-16
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
weblate — 5.17

Similar Threats

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