How severe is CVE-2026-23535?

CVE-2026-23535 has a CVSS score of 8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-23535?

CVE-2026-23535 affects the following packages: wlc (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2026-23535?

Update wlc to 1.17.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-23535 is resolved across your whole dependency graph.

How do I detect CVE-2026-23535 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wlc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-23535 if there is no patch (or I can't update yet)?

Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Is CVE-2026-23535 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-23535 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-23535?

CVE-2026-23535 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 33th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-23535?

CVE-2026-23535 is classified as Path Traversal (CWE-22). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-23535 published, and has it been updated?

CVE-2026-23535 was published on January 16, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍

🐍 PyPI

Not in CISA KEV

HIGH severity

CVE-2026-23535 — wlc

HIGHFix: WeblateOrg/wlc@216e691

CVE-2026-23535 is a high-severity (CVSS 8) Path Traversal vulnerability in wlc. A fix is available for wlc — see the affected versions and patch details below.

wlc Path traversal: Unsanitized API slugs in download command

Also known asGHSA-mmwx-79f6-67jgPYSEC-2026-2053

Published

Jan 16, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-23535.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs33th percentile — riskier than 33% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐍wlc

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Multi-translation download could write to an arbitrary location when instructed by a crafted server.

Patches

https://github.com/WeblateOrg/wlc/pull/1128

Workarounds

Do not use wlc download with untrusted servers.

References

This issue was reported to us by wh1zee via HackerOne.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`wlc`	all versions	1.17.2`pip install --upgrade 'wlc==1.17.2'`

Affected Products

1 product · 1 configurations

Application

wlcweblate

< 1.17.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wlc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update wlc to 1.17.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-23535 is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

### Impact Multi-translation download could write to an arbitrary location when instructed by a crafted server. ### Patches * https://github.com/WeblateOrg/wlc/pull/1128 ### Workarounds Do not use `wlc download` with untrusted servers. ### References This issue was reported to us by [wh1zee](https://hackerone.com/wh1zee) via HackerOne.