CVE-2026-23535 wlc Path traversal: Unsanitized API slugs in download command
A malicious Weblate server can force the wlc CLI to write files to arbitrary locations via unsanitized API slugs during downloads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-23535?
CVE-2026-23535 is a high-severity path traversal vulnerability in WeblateOrg wlc, published on 16 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
wlc is a Weblate command-line client using Weblate's REST API. Prior to 1.17.2, the multi-translation download could write to an arbitrary location when instructed by a crafted server. This vulnerability is fixed in 1.17.2.
Weakness: CWE-22
Which versions are affected by CVE-2026-23535?
3 open source packages ship an affected version, including wlc. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wlc PyPI | All versions | 1.17.2 |
wlc PyPI | All versions | 1.17.2 |
wlc PyPI | All versions | 1.17.2 |
Products include Weblate Wlc.
How do I fix CVE-2026-23535?
Upgrade wlc to 1.17.2 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-23535 being exploited?
There is no known exploitation of CVE-2026-23535 in the wild and no public exploit code.
Other vulnerabilities in WeblateOrg wlc
Sources
Also known as DEBIAN-CVE-2026-23535, GHSA-mmwx-79f6-67jg, PYSEC-2026-2053, UBUNTU-CVE-2026-23535.