PatchTheCVECVE-2021-24478: The Bookshelf WordPress plugin through 2.0.4 does not sanitise or escape its "Paypal email address" setting be
CVE-2021-24478 is a medium-severity flaw (CVSS 5.4) affecting bookshelf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Bookshelf WordPress plugin through 2.0.4 does not sanitise or escape its "Paypal email address" setting before outputting it in the page, leading to an authenticated Stored Cross-Site Scripting issue
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-2021-24478?
bookshelf: upgrade to newer than 2.0.4. Exact commands for each OS are on this page.
Is CVE-2021-24478 being exploited?
CVE-2021-24478 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-2021-24478 affect?
CVE-2021-24478 affects bookshelf. Severity is medium (CVSS 5.4). The Bookshelf WordPress plugin through 2.0.4 does not sanitise or escape its "Paypal email address" setting before outputting it in the page, leading to an authenticated Stored Cross-Site Scripting issue
How urgent is CVE-2021-24478?
Priority 36/100. Public exploit reference