PatchTheCVECVE-2021-24503: The Popular Brand Icons – Simple Icons WordPress plugin before 2.7.8 does not sanitise or validate some of its
CVE-2021-24503 is a medium-severity flaw (CVSS 5.4) affecting popular brand icons - simple icons. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Popular Brand Icons – Simple Icons WordPress plugin before 2.7.8 does not sanitise or validate some of its shortcode parameters, such as "color", "size" or "class", allowing users with a role as low as Contributor to set Cross-Site payload in them. A post made by a contributor would still have to be approved by an admin to have the XSS triggered in the frontend, however, higher privilege users, such as editor could exploit this without the ne
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-08-02 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-24503?
popular brand icons - simple icons: upgrade to 2.7.8. Exact commands for each OS are on this page.
Is CVE-2021-24503 being exploited?
CVE-2021-24503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-24503 affect?
CVE-2021-24503 affects popular brand icons - simple icons. Severity is medium (CVSS 5.4). The Popular Brand Icons – Simple Icons WordPress plugin before 2.7.8 does not sanitise or validate some of its shortcode parameters, such as "color", "size" or "class", allowing users with a role as low as Contributor to set Cross-Site payl
How urgent is CVE-2021-24503?
Priority 36/100. Public exploit reference