CVE-2026-42150
wlc: print_html outputs API data without HTML escaping, enabling stored XSS
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- High
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
wlc: print_html outputs API data without HTML escaping, enabling stored XSS
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
CVE-2026-42150- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2026-28501
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
EUVD-2026-28501- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-gx2m-mcc2-r4p3
wlc: print_html outputs API data without HTML escaping
Impact
The HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser.
Patches
Workarounds
The only vulnerable code path is HTML output which is opt-in.
References
Weblate thanks @fg0x0 for reporting this on GitHub.
- Record
GHSA-gx2m-mcc2-r4p3- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
CVE-2026-42150- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
wlc: print_html outputs API data without HTML escaping, enabling stored XSS
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
CVE-2026-42150- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-42150
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
DEBIAN-CVE-2026-42150- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-gx2m-mcc2-r4p3
wlc: print_html outputs API data without HTML escaping
Impact
The HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser.
Patches
Workarounds
The only vulnerable code path is HTML output which is opt-in.
References
Weblate thanks @fg0x0 for reporting this on GitHub.
- Record
GHSA-gx2m-mcc2-r4p3- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVPYSEC-2026-2321
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
PYSEC-2026-2321- CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-42150
wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.
- Record
UBUNTU-CVE-2026-42150- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L - CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
wlcPyPI |
before 2.0.0 | 2.0.0 |
wlcDebian:12 |
All versions, plus listed versions 1.13-21.14-11.15-11.15-21.16.1-11.17.2-12.0.0-12.2.1-1 |
None known |
wlcDebian:13 |
All versions, plus listed versions 1.15-11.15-21.16.1-11.17.2-12.0.0-12.2.1-1 |
None known |
wlcDebian:14 |
before 2.0.0-1, plus listed versions 1.15-11.15-21.16.1-11.17.2-1 |
2.0.0-1 |
wlcPyPI |
before 2.0.0, plus listed versions 0.00.10.100.20.3 Show 26 moreShow less0.40.50.60.70.80.91.01.11.101.111.121.131.141.151.16.11.17.01.17.11.17.21.21.31.41.51.61.71.81.9 |
2.0.0 |
wlcUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 0.8-10.8-1ubuntu0.1~esm1 |
None known |
wlcUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 1.1-11.2-11.2-1ubuntu0.20.04.1~esm1 |
None known |
wlcUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 1.2-11.2-1ubuntu0.22.04.1~esm1 |
None known |
wlcUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 1.13-21.13-2ubuntu0.1~esm1 |
None known |
wlcUbuntu:25.10 |
All versions, plus listed versions 1.15-11.15-21.15-2ubuntu0.1 |
None known |
wlcUbuntu:26.10 |
All versions, plus listed versions 1.16.1-12.0.0-1 |
None known |
wlcUbuntu:26.04:LTS |
All versions, plus listed versions 1.15-21.16.1-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-42150 is a medium vulnerability (CVSS 5.1) in Weblate Wlc, published April 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in wlc 2.0.0.