CVE-2021-3989 json
Open Redirect in star7th/showdoc
published 2021-12-01 4 y ago modified 2026-06-17 4 mo ago also GHSA-f545-vpwp-r9j7 , EUVD-2021-2508
- cvss
- 6.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
showdoc is vulnerable to URL Redirection to Untrusted Site
Patch / fix
- packagist showdoc/showdoc 2.9.13
- star7th star7th/showdoc 2.9.13
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/ffc61eff-efea-42c5-92c2-e043fdf904d5 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
| 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 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | showdoc/showdoc | <2.9.13 |
2.9.13 |
Affected products
- star7th star7th/showdoc
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/star7th/showdoc/commit/335afc7ed6d6627c3d0434aa9acc168c77117614
web, patch, third-party-advisory
-
huntr.dev
/bounties/ffc61eff-efea-42c5-92c2-e043fdf904d5
web, exploit, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3989
advisory
-
github.com
/star7th/showdoc
package
Sources
- CVE List CVE-2021-3989
- GitHub Advisory GHSA-f545-vpwp-r9j7
- NVD CVE-2021-3989
Fencer Vulns 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.