CVE-2021-21283 is a cross-site scripting (XSS) vulnerability affecting the "Flarum Sticky" extension versions 0.1.0-beta.14 and 0.1.0-beta.15, an open-source discussion platform component. The vulnerability allows for HTML injection, enabling JavaScript execution from HTML attributes within the first post of a pinned discussion. This medium-severity vulnerability (CVSS 5.4) requires low privileges and user interaction, with potential impacts on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
0.1.0CPE matchmatch criteria | cpe:2.3:a:flarum:sticky:0.1.0:beta14:*:*:*:*:*:* | ||
0.1.0CPE matchmatch criteria | cpe:2.3:a:flarum:sticky:0.1.0:beta15:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.