CVE-2021-3783 json
Cross-site Scripting (XSS) - Reflected in yourls/yourls
published 5y ago modified 4mo ago also GHSA-cpq8-x35g-m439 , EUVD-2021-2041
- cvss
- 6.6
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Patch / fix
Is CVE-2021-3783 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.6 | CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| GitHub | 3.0 | 6.6 | CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | yourls/yourls | <=1.8.2 |
no fix listed |
Affected products
- yourls yourls/yourls
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4
web, patch, third-party-advisory
-
huntr.dev
/bounties/b688e553-d0d9-4ddf-95a3-ff4b78004984
web, issue-tracking, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3783
advisory
-
github.com
/yourls/yourls
package
Sources
- CVE List CVE-2021-3783
- GitHub Advisory GHSA-cpq8-x35g-m439
- NVD CVE-2021-3783
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.