Vulnerability details
CVE-2026-43887
outline outline
Outline: Stored XSS via Comment Mentions
CVSS 3.1
7.3High
Official description
Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.6.1, the Outline comment section permits users to mention other users; however, the backend does not validate or sanitize the href attribute associated with these mentions. As a result, potentially dangerous protocols (e.g., javascript:) are not filtered, introducing a risk of client-side code execution. This vulnerability is fixed in 1.7.0.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.3High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| outline | outline | >= 0.84.0, < 1.7.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/outline/outline/security/advisories/GHSA-rqrg-f3qc-xvgh x_refsource_CONFIRM
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Details
- Published
- 2026-05-12
- Last updated
- 2026-05-15
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.24%
Probability of exploitation in 30 days
15.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')