CVE-2021-31330 json
A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier.
published 2022-05-11 4 y ago modified 2026-06-17 4 mo ago also BIT-reviewboard-2021-31330 , EUVD-2021-18240
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.
Exploit prediction
0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- mattschmidt.net https://mattschmidt.net/2021/04/14/review-board-xss-discovered/ 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 |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | reviewboard | >=3.0.20, <=3.0.20 >=4.0-beta1.0, <=4.0-beta1.0 >=4.0-beta2.0, <=4.0-beta2.0 >=4.0-rc1.0, <=4.0-rc1.0 |
no fix listed |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
mattschmidt.net
/2021/04/14/review-board-xss-discovered/
exploit, third-party-advisory, web
-
reviewboard.org
/news/2021/04/14/review-board-3-0-21-and-4-0-rc-2-security-bug-fixes-and-docker/
release-notes, vendor-advisory, web
-
reviewboard.org
/docs/releasenotes/reviewboard/3.0.21/
release-notes, vendor-advisory, web
-
reviewboard.org
/docs/releasenotes/reviewboard/4.0-rc-2/
release-notes, vendor-advisory, web
Sources
- CVE List CVE-2021-31330
- NVD CVE-2021-31330
- OSV BIT-reviewboard-2021-31330
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