Description
Impact
The Markdown renderer used in user comments and other user-provided content didn't properly sanitize some attributes.
Patches
- https://github.com/WeblateOrg/weblate/pull/19259
Workarounds
Even though the attacker might be able to inject code into the HTML, the Weblate's strict CSP should mitigate the risks.
Acknowlegement
Michal Čihař has identified and fixed this vulnerability.
Basic information
- Type
- reviewed
- Severity
- medium
- Advisory on GitHub
- Open advisory ↗
- Repository advisory
- Open repository advisory ↗
- Source code
- Browse source ↗
- Published (advisory)
- 2026-05-07 00:04:26 UTC
- Updated
- 2026-05-08 21:47:44 UTC
- GitHub reviewed
- 2026-05-07 00:04:26 UTC
- NVD published
- 2026-05-07
EPSS Score
| Score |
Percentile |
|
0.03%
|
8.77% |
CVSS Scores
| Base score |
Version |
Severity |
Vector |
|
4.3
|
3.1 |
—
|
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Click to expand
- Attack vector (AV:N)
- Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
- Attack complexity (AC:L)
- Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
- Privileges required (PR:L)
- A normal user session is enough; they don’t have to be admin.
- User interaction (UI:N)
- Nobody has to click “OK” or open a trap file; it can work without a victim helping.
- Scope (S:U)
- Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
- Confidentiality (C:N)
- Doesn’t really leak secrets in a meaningful way.
- Integrity (I:L)
- Attackers could change some data, but it’s limited—not everything goes.
- Availability (A:N)
- Service keeps running; no real outage angle.
|
CWEs
| CWE id |
Name |
|
CWE-79
|
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') |
|
CWE-80
|
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) |
Affected packages (1)
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem |
Package |
Vulnerable range |
First patched |
Vulnerable functions |
| pip |
weblate |
< 5.17.1 |
5.17.1 |
—
|
cvelogic
Threat Intelligence