CVE-2021-33483 json
An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8.
published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20186
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
An issue was discovered in CommentsService.ashx in OnyakTech Comments Pro 3.8. The comment posting functionality allows an attacker to add an XSS payload to the JSON request that will execute when users visit the page with the comment.
Exploit prediction
0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- burninatorsec.blogspot.com https://burninatorsec.blogspot.com/2021/07/onyaktech-comments-pro-broken.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
burninatorsec.blogspot.com
/2021/07/onyaktech-comments-pro-broken.html
exploit, third-party-advisory
-
twitter.com
/onyaktech
third-party-advisory
Sources
- CVE List CVE-2021-33483
- NVD CVE-2021-33483
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.